Malicious PDF — malware analysis report

Static analysis result for SHA-256 42110a252eb3cadf…

MALICIOUS

PDF

80.8 KB Created: 2021-04-02 04:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d983e13167df1ae9858c2b5584051e SHA-1: 7595dc07f41a9da648ea5000f73f236c33579ae7 SHA-256: 42110a252eb3cadf3cc1c9761f94d804154948660536eb3254ca32c93cddeaa1
204 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including an ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a "PDF_SEO_LINK_FARM" heuristic and numerous external URIs suggests the document is part of a link farm designed to distribute malicious content or engage in SEO-based scams. The "SE_ADVANCE_FEE_SCAM_LURE" heuristic strongly indicates the document's purpose is to trick users into believing they are entitled to a prize or funds, requiring them to take an action like downloading a file or providing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=printable+blank+board+games+pdf
    • http://teroved.22web.org/who_is_the_voice_of_the_female_mandalorian.pdf
    • http://dokovuxumev.22web.org/64898301328.pdf
    • http://cheapestshop.xyz/free_speed_test67xzh.pdf
    • http://vas-rem.ru/varinawovogoil87p.pdf
    • http://magicwoolshop.com/critical_ops_apk_data_latest_versiondp18a.pdf
    • http://wuxabikizumir.22web.org/caustic_drain_cleaner_safety_data_sheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79bbbbc7-edcd-4592-96a0-ac901d3d3b4b/57326721963.pdf
    • http://lexuwusifo.epizy.com/feruzat.pdf
    • http://mebexadesojixip.rf.gd/yasuo_bottom_guide.pdf
    • http://rereroma.epizy.com/dodusab.pdf
    • https://uploads.strikinglycdn.com/files/ab8f20d7-af1f-4a37-b7bc-54769cc3d739/julidunuligojoj.pdf
    • https://uploads.strikinglycdn.com/files/c907cc75-4b96-4642-8ad1-ca1050d74501/womexixotegul.pdf
    • https://uploads.strikinglycdn.com/files/68153af4-bf70-4110-a63a-61cb92c203fa/monster_girl_doctor_watch_episode_2.pdf
    • https://uploads.strikinglycdn.com/files/105d3e22-4d06-4938-81f9-7271565e0c71/xavikivuxevovopiz.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_abbeae15154c4b238ed5bba01a963d6f.pdf?index=true
    • http://xupudajiwozov.epizy.com/apple_report_phishing_website_ahead.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_54e1f9d8975b44c395c27316b26ee204.pdf?index=true
    • http://tasobigadegef.epizy.com/synonyms_worksheet_for_grade_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe22.bin
9c19be76c1c16f0517a1357622723884fd6cee8a05f45afec87fba134f6f67dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 5564 bytes
font_01_sfnt_off000110f0.bin
10ed805d2a68e2a0022377116d77c5e92f9cdae47a0bf13279a6e7225d7e1ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 10968 bytes

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