Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66f3ceebaebfcee…

MALICIOUS

PDF

73.2 KB Created: 2020-11-24 03:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 872a19c8367fb46f67943724a96f5794 SHA-1: 8905693c6d3a7a4154514a48594cebf58c467664 SHA-256: b66f3ceebaebfceec56c769773905de7cee1c4401deca752bc48a82fcb499d51
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a brand-impersonation credential phishing lure for Facebook. It contains a mass external PDF link farm hosted on disposable domains, with multiple links pointing to weebly.com, suggesting a coordinated phishing campaign. The embedded URLs likely lead to further stages of the attack, such as credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jemokufofek.weebly.com/uploads/1/3/4/3/134312150/kokatogezulitewi.pdf.
  • 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://trafffi.ru/strik?utm_term=flame+painter+free PDF link annotation
    • https://jemokufofek.weebly.com/uploads/1/3/4/3/134312150/kokatogezulitewi.pdfIn PDF document text
    • https://derakudo.weebly.com/uploads/1/3/4/2/134266069/kaximebifatebotepad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f92d487de9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_5fb25bb6691a9.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/35c5aeb.pdfIn PDF document text
    • https://fejigurize.weebly.com/uploads/1/3/4/5/134509658/481501.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/getoxakagesa.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdfIn PDF document text
    • https://tazusarativiwu.weebly.com/uploads/1/3/4/5/134510609/zepizux.pdfIn PDF document text
    • https://fobibopokigafo.weebly.com/uploads/1/3/4/7/134702456/mutemo_bawidatav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418369/normal_5fb4560a24769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/ap_eamcet_hall_ticket_2019_date.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 3292 bytes
SHA-256: 63d8c90d6a0f151f8ac026a6e80fb453a23f8ac475f108f7d2f1bca70c2e270e
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 4824 bytes
SHA-256: 822f465a7ceedea7e9965ebcee9ea04965a1be07e818fa07ba809ee5a9acc3cf
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 11532 bytes
SHA-256: 01753ebb84a95ec313e93b3f7dfc5bc0ca93af79c1bde1aac7766daba358633e

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