Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ae6e36266af2d…

MALICIOUS

PDF

96.6 KB Created: 2021-03-21 21:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 01799d17f572956e47b5ab3ff7e7ea1a SHA-1: 21bfde0075d6806e595361b821b9820ab0d8dbc1 SHA-256: 8f8ae6e36266af2d8274b0edc10be2170b098ae73fdafd7b348e0a1c55e0aeb8
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://baarspo.ru/strik?utm_term=ejercicios+resueltos+del+libro+de+fisica+2+bgu', appears to be a lure for users seeking educational content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=ejercicios+resueltos+del+libro+de+fisica+2+bgu PDF link annotation
    • http://nafarami.medianewsonline.com/kajeji.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/50031108867.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/74059775462.pdfIn PDF document text
    • http://nuwevabufa.mypressonline.com/zonojimaregam.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/63028602232.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/j1wHghG/60002734324.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/88748495027.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/rojibulexirivanuzipuzox.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ifjeieG/brave_frontier_heroes_across_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31265822-679e-45ee-b242-80f5bf3af43f/husqvarna_323l_weed_eater_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8670eddd-43b6-42a3-a449-ed88931ea29c/common_nouns_exercises_for_class_3.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_3f50b19e3799439f8ee1d29d5b585a2e.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_cd0c6237fbe34304879e96bd10c8ffc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ad15b7-ca7e-4777-aa59-c5fd039bb903/elastic_potential_energy_worksheet_answers.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_cfcb84ee65754f0880d31055a44e9555.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/373939bb-3b9c-4eb1-b7fe-c49379eccb4d/39287055682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347b7e1a-fe58-4843-bac8-f72566b86c9a/d-link_dir-655_setup_wizard_download.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/arabian_nights_hookah_flavour.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d065cbd97f8641e89ddd546405429dd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50cce63-0cd8-4e86-ad4d-98e07f417e46/33575510061.pdfIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_8334a0178dc94f0fb5532c03c1b8fbb3.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 5492 bytes
SHA-256: edea11b7e3770f4dc4b09e3ab048de8eaead16973a47e6e5d36f72979b546e95
font_01_sfnt_off000131f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F8 13412 bytes
SHA-256: 1923e0869bf50596a5f7cc0501db056969f5c43da8ea57e4d410b7aa2b6d9ebf
font_02_sfnt_off00015d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D73 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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