Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb609067c2d5442…

MALICIOUS

PDF

76.4 KB Created: 2021-05-27 09:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d1bc3797ae8d5812f22826d20f3b3dce SHA-1: 45354f88aa15dc2e4c591b723a3d7fba4d9e8a63 SHA-256: 4fb609067c2d5442947b4038eb83cdef5589b6ee9d23bb04d54965df4579e9d7
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various external URLs, including a suspicious domain 'zajinet.ru' which is likely part of a phishing or scam operation. The document's structure and embedded links suggest an attempt to manipulate search engine results and lure unsuspecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=downton+abbey+movie+streaming+hulu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5fe6e7dd7d90b.pdfIn PDF document text
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/tizafu.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/wimitafave_rudelizixa_xixafupa_runibagenazigox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fec30d3d229d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5fe5dd82a98c1.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/pefovubovozape-bekab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fca95c31692d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb7d38667e.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/7692367.pdfIn PDF document text
    • https://pukewuvidepuf.weebly.com/uploads/1/3/4/3/134321324/dowaza.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/2b0da39.pdfIn PDF document text
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/1815.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/lugobizaroz.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/dimofijupesonitatar.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/lakelino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5509455e-f626-4487-8880-19c2e87fc5b1/explain_risk_measurement_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b491b37c-7e57-4391-8fd0-c7c4be8c2d02/craftsman_table_saw_extension_wing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cb93f9-a811-4c80-ac1c-aca38502f807/10417143256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dba8ce-72de-41b7-9743-a2eb5b942560/what_all_should_my_13_month_old_be_doing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b0bdfd-d4ee-4e88-9c6f-a1880f1ab65e/ledadugesiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cc0fea-a622-4c8b-bf88-87a4a0ea17d3/words_their_way_primary_spelling_inventory_excel_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64ef21d-8284-460d-a900-089586480336/49305714235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b07b603-d5c9-4ff2-9b90-12c3160a3f08/66831800459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec20aa2-5ea9-452d-9e5b-61aeaefc754e/can_you_get_cosmetic_surgery_if_you_have_high_blood_pressure.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 5492 bytes
SHA-256: f5ccad664b585d2b5113448bac5888e5e406456162e5f79a27077f6595ccebca
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10376 bytes
SHA-256: af5225590dca2922aa61d4c154a9dc4ddaad8a924bc0a4934691d4b20b8dd3e4

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