Malicious PDF — malware analysis report

Static analysis result for SHA-256 16797c3a4a4a035c…

MALICIOUS

PDF

88.9 KB Created: 2021-05-01 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5bcfd588e9948df734da30f722b7cc2a SHA-1: 3f5e38fa91097b5c09a8e782786e56bdb9506fe3 SHA-256: 16797c3a4a4a035c61e25479ce9b3b2f26d82b7d4563c3b148abcd11eb11e67e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=little+red+riding+hood+movie+on+netflix PDF link annotation
    • http://krokoboko6.xyz/bengali_movie_skymovies._inz1ka6.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/mididavisezopereriluror.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/88350347751.pdfIn PDF document text
    • http://ranixora.iblogger.org/a4_brochure_template_photoshop_free.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/academic_writing_phrase_bank.pdfIn PDF document text
    • http://dakijexok.22web.org/49151053002.pdfIn PDF document text
    • http://bizbize-yeteriz.org/muwiwibuzowubmgp8p.pdfIn PDF document text
    • http://elinekici.online/54500031359cuh01.pdfIn PDF document text
    • http://juwapes.22web.org/synergy_1._10_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/43a87b08-cff5-487c-94b8-59d46ba84304/how_to_find_ratio_with_variables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8596a26-d084-4b01-86f0-e01191b461df/nixowodigofowolugotevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042f8db4-492a-4fa6-9489-4d3021d7fcb2/baluxi.pdfIn PDF document text
    • http://vaguxaza.epizy.com/49511727555.pdfIn PDF document text
    • http://nulesuli.epizy.com/nobleness_enkindleth_nobleness_questions_and_answers.pdfIn PDF document text
    • http://wuzitipajupenok.rf.gd/tawenoboxedowofawusaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c0de1f-03ea-4891-9502-32856806c055/final_quest_rick_joyner_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0565643b-e630-43da-a09c-bcef3cdf3665/simulation_ionic_and_covalent_bonding_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2283792-22be-4085-a6ca-66c1eea83262/wii_u_virtual_console_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98131cc-5e9a-4e77-a966-4db34789afe1/17507653752.pdfIn PDF document text
    • http://dovudegumigisaw.rf.gd/zinurobixamidazeduvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8768ca-9ed0-48b0-b0a8-467d1354f100/juwerabapabaluvudebadadop.pdfIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 4788 bytes
SHA-256: 3e5f526adec3a18673c62d503da90deddd4798641cc1919608b04c71c87bd299
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 2752 bytes
SHA-256: 9d32252858d52816b0822875fd7db6a9c2728712aa6e14c5ce467fc86adfb8bd
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 11692 bytes
SHA-256: 5754c65c519098c7a3dff3c92b99da36fb5cc73fdb9723501ec521f6ffae91e6
font_03_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 16488 bytes
SHA-256: 90518ca7e605c148e94bc17d9ea4d7549777ba29ddf572df6deb86868225552a
font_04_sfnt_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378