Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfc634047373718…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 23:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8a8a28ba1a06e59534854d4d100005f6 SHA-1: 8b9783642e4a882adda3fbeac03add827ce3ce54 SHA-256: abfc6340473737186885f192e6800e299540495a4d45c98eb70fd25e4f0cff9b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains, which is a common tactic for SEO manipulation or distributing further malware. The presence of multiple external links and its classification as a link farm strongly suggests it's part of a larger malicious infrastructure.

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/wix?keyword=distributive+property+word+problems+7th+grade+worksheet PDF link annotation
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/xojadewuxuperidadij.pdfIn PDF document text
    • http://flipping-car.online/marketing_digital_funcionacugpk.pdfIn PDF document text
    • http://fullstacket.online/sadogujq82ri.pdfIn PDF document text
    • http://creampiepow.club/rapupul26k4n.pdfIn PDF document text
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/fajuzobuzigitupef.pdfIn PDF document text
    • http://notdull-eng.online/zaxavomofafupazoburaj7mu1h.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/what_does_denervation_hypersensitivity_meandud2d.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/5494585.pdfIn PDF document text
    • https://pivisagut.weebly.com/uploads/1/3/2/8/132815367/mopuxijusexig-gexavoduvozos.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/hafidje/my_etisalat_afg_apk_download.pdfIn PDF document text
    • http://aduo5.online/think_like_a_man_bookxhqvu.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/j5viaQ1/pifidixezibowalisavilavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_2131c1126f29412c88ebb205413c60f8.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_7e0f1cd0daba4f7aab9958ac131f9c3a.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_67ff36eb99084ff990f9fdc0210b35c4.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_8526c4d00a83414692ce8d48bc1dac89.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_c41339a194e84cb2bfc20a68d1af6b3c.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_ee95b18805224c94b414f8140482d1cd.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_3d027ad6fdbe4f729d1a49970da0eb25.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_dd970a6be8f442d9b92685c9f77fa016.pdf?index=trueIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_e5c8afb448404f48b14d0d7aa1217a1f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 5908 bytes
SHA-256: 0936910be1097cbe68e21d90633f53aef6b5c79fda06199e4812921307a980a9
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 11652 bytes
SHA-256: aff4faee877ecdb18174ae8f9904cc29762b748775d2168becefa1975cf7f376