Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f04ee8afedec80…

MALICIOUS

PDF

108.8 KB Created: 2021-04-04 18:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd899eaff593e45539b6a6e53caec0e6 SHA-1: cf64e92710420e9f8062c62927ab65417b4a90e0 SHA-256: 22f04ee8afedec80b51e28c4eea2d1273aa9bd83702507e569cdf1001216820b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=bhagavad+gita+18th+chapter+in+tamil+pdf PDF link annotation
    • http://libopadu.scienceontheweb.net/the_bluest_eye_play.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/65944784053.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/negarebekujo.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/hjwhehj/onkyo_receiver_chromecast_built_in.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/vesekukufijunu.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/fepajilefoxow.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/5b58af.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/99995904035.pdfIn PDF document text
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/5571762.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/4fe3c6bbf8e.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/jQ0ihVq/arumugam_movie_tamilrockers.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/arabidopsis_book.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/3341125.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/9044210.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5953924f-efdb-4633-a726-095044cf0c72/frigidaire_dehumidifier_50_pint_with_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422d0184-43de-40e4-90df-3ee869992aac/el_alquimista_de_paulo_coelho_audiolibro_completo_narrado_en_espaol.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/how_do_you_fix_a_washing_machine_drain_hose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e42da2-ab9a-41f8-bc28-a7ad8a9bbcd8/gulegabukowemojisiguj.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/anna_university_automobile_engineering_syllabus_2020.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/46539436989.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000139c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x139C3 28688 bytes
SHA-256: 3f99f8b60fe0382e391dba8430a1479d8a80d4e5bb8a7f81a4c384f39c059147
font_00_sfnt_off00012779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12779 5424 bytes
SHA-256: e390e9969ac2be140f02d6ba367a3eb0924e8c78c2d35f29ecc340bf7e2908da
font_02_sfnt_off000172aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AA 9852 bytes
SHA-256: b1adbcac14e064c7110d18c349facc64d567fc473a34d69ec33c468811273583
font_03_sfnt_off00019406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19406 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3