Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f3f6d333f6323d…

MALICIOUS

PDF

73.9 KB Created: 2021-06-10 04:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee0a0cfe02beb9fb6d04111c307d8fc2 SHA-1: 697f2e3aef22da48d6820ab0d887985f001e7a73 SHA-256: b7f3f6d333f6323d625d225f0fd26d3bb1c86ef07c88d4306ad40b1f1bf15202
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive content or by leading them to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=physiology+lecture+notes
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/4850292.pdf
    • https://fojulivopex.weebly.com/uploads/1/3/4/7/134718782/kusubajuxo_ziwid_negedapube_biduvobine.pdf
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/9836988.pdf
    • https://cdn-cms.f-static.net/uploads/4419002/normal_60435267264e4.pdf
    • https://cdn-cms.f-static.net/uploads/4469638/normal_606e90244fd22.pdf
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/rumafume_fonino.pdf
    • https://tuderosuf.weebly.com/uploads/1/3/4/6/134652240/fatarix.pdf
    • https://cdn-cms.f-static.net/uploads/4463275/normal_6061e902cced1.pdf
    • https://cdn-cms.f-static.net/uploads/4401985/normal_604b5364e0e08.pdf
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/0e375c7.pdf
    • https://cdn-cms.f-static.net/uploads/4414852/normal_6029e9a195112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fokopaviwu.pbworks.com/f/zelebixedumalilojiz.pdf
    • http://rugewenuzed.pbworks.com/w/file/fetch/144426525/minecraft_mc_heli_mod_1.12_2.pdf
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdf
    • https://uploads.strikinglycdn.com/files/d9523fde-977c-4b1a-9f94-fc5739a174ae/pedigepur.pdf
    • https://uploads.strikinglycdn.com/files/d03dd841-2054-48e6-ab2f-275eef4e4664/gazugegakefaxewol.pdf
    • https://uploads.strikinglycdn.com/files/5f6c516c-ebaa-40a5-abcf-a2e5ae953cc2/barbie_and_the_swan_lake_full_movie_watch_online.pdf
    • http://jajafad.pbworks.com/f/lotefirutatugurorusirip.pdf
    • https://uploads.strikinglycdn.com/files/7df63d91-375d-4706-abbf-fa29b09343be/jometokaxafaku.pdf
    • https://uploads.strikinglycdn.com/files/f2ce1831-631e-4a9e-bfd3-b70e5d72d362/56570152181.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_off0000e369.bin
aef5a0c88cba89d4821d112d240ed313e0e4be27b69e62cf3da779c1f99914ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 4952 bytes
font_01_sfnt_off0000f44c.bin
9590192ec40346e90fecee66b418d7b840d26ed6dbef6a8567e077abfd1052f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10640 bytes

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