Malicious PDF — malware analysis report

Static analysis result for SHA-256 207a0cd8246b9880…

MALICIOUS

PDF

71.3 KB Created: 2021-01-05 04:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: de3d435e90a818886c1c6bf56dfd3e33 SHA-1: 7e3ac170bffe2e8e9c928ac6e665d64e39c29ba7 SHA-256: 207a0cd8246b988099b1950c4a46a1e8369177968b640a9138d56de7504bf53c
246 Risk Score

Malware Insights

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

This PDF document contains a link farm and impersonates Gmail to lure users into clicking a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential phishing or to download a second-stage payload. The embedded URLs and link farm structure suggest an attempt to distribute malware or phish for sensitive information.

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://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/09a89d87.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://trafftec.ru/aws?utm_term=2nd+line+premium+apk+latest+version PDF link annotation
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/09a89d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_5fd624b469da5.pdfIn PDF document text
    • https://zazivobonapi.weebly.com/uploads/1/3/2/6/132696398/nisozizafaligiporaje.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://mulelene.weebly.com/uploads/1/3/4/4/134440938/dalunepokusut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fe263e314719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fa7bf29d5f5e.pdfIn PDF document text
    • https://xokapajutubesa.weebly.com/uploads/1/3/4/7/134730315/simozofonugupos_xegebitovumuvu_warigavitupoxa_kugugarovatopa.pdfIn PDF document text
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/4196019.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/ninumanelenubeviw.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/jaloto/vcop_1_game.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/sewebewo.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 5264 bytes
SHA-256: 06626498ec1cdeec20a59fbf9338c4d437dbe97758ca465f0b73674bfc9ce9ec
font_01_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 11040 bytes
SHA-256: 37124710385bd12ab728b5b9f9a40b3c9a22a36532e4205a208d894b1ec423da

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