Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd85e734335215…

MALICIOUS

PDF

111.4 KB Created: 2021-03-20 18:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7031062cb6960de0b08f99b6d58ebe58 SHA-1: 427d2609a35f3c6b45df159f6d6ef8b20ee0b6ea SHA-256: 5bdd85e73433521561f8d8def7613e1bf759bf7ff99bb7dfeb46e0dc3a633ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, with one pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=powers+of+imaginary+numbers+worksheet+pdf PDF link annotation
    • http://rudovatimokasum.medianewsonline.com/vexutevofen.pdfIn PDF document text
    • http://fepenikozi.22web.org/new_testament_bible_trivia_questions_and_answers.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/how_to_structure_a_character_arc.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/borges_ficciones_english.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/voltage_and_current_divider_problems.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/wovobatupekeluw.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/xegovodixunegoletite.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/17115999056.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/kovize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_d2af5d06690e4e0b9c2f34a4350546c1.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_9c99c18871264e3ebad1d70093c3bf48.pdf?index=trueIn PDF document text
    • http://sagunum.rf.gd/how_do_i_check_my_ebt_food_stamp_balance_online.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_acf96f91fb8144b7961e596090d2667b.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_452296bab12c42848faa586ffd611b27.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_3c8ec512ba124a8d98c5a9f08d4d72fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed8f45e-5c79-4e5a-b960-5b19a0c6b1f9/what_are_the_different_teaching_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5386617c-964d-4744-80d4-bfbba64d57f4/in_order_to_prepare_an_income_statement_using_the_account_balances.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_ef1bd3117d9f4196b3f904a73332e76b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33abad9d-6e97-4974-b949-a0ff90d245ab/bersa_thunder_380_recommended_ammo.pdfIn PDF document text
    • http://nutagax.rf.gd/vatican_and_sistine_chapel_guided_tour.pdfIn PDF document text
    • http://motitagododef.epizy.com/namusozusapexesavi.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/50545985307.pdfIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_cb486c4b0862479d9a87e95ade05b535.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_73940b94626b45c3ad1fde570c6fdfcf.pdf?index=trueIn PDF document text
    • http://wovotunuvovon.epizy.com/wirezanaliz.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_84bd779c48374dc1a9d3f7a2d834ae92.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 3432 bytes
SHA-256: a80d4cba6abbf58128a8ff0e87d01940fe9091217c5c068585d24b1a5503b016
font_01_sfnt_off0001437a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 5820 bytes
SHA-256: 11a3dd8e7e5e81db95b28995c866bf71c44501f3e6254d26447f3bda1c7c6695
font_02_sfnt_off00015734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15734 14504 bytes
SHA-256: 02cd029f832f027828ee3725fddbc8c5fc9c414e3af91bb9ea7a7b8e1f22834c
font_03_sfnt_off00018884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18884 16636 bytes
SHA-256: add8f18d9c58037c8a049bd3a74e458434e1e3497b1c87464c8467a78b5071bf
font_04_sfnt_off00019f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6D 6112 bytes
SHA-256: 600f795c0f97540f0272d38f1b0e3c668c070789f65a2593637decfcde03968a