Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa92d964fc608cb…

MALICIOUS

PDF

70.8 KB Created: 2020-12-01 11:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b1539a64dbad4db0a00dfd23b1a24a27 SHA-1: d890483c6a61e6f05126557d0b596e5d3e7709e2 SHA-256: 2fa92d964fc608cbde0077fb5a5e13e10e2cc542e1f3eec38f50a87401b618f0
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://zolekifez.weebly.com/uploads/1/3/4/8/134850144/duxogutoden.pdf.
  • 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/123?utm_term=boost+mobile+sim+card+activation PDF link annotation
    • https://zolekifez.weebly.com/uploads/1/3/4/8/134850144/duxogutoden.pdfIn PDF document text
    • https://zewiloda.weebly.com/uploads/1/3/4/6/134655603/vomiviv_xixuwaf_dagixovawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5fc3671ac3116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_5f9fc656b23ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f97451426552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f9e087521935.pdfIn 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://static1.squarespace.com/static/5fc12052bd14ff0dd29e0ecd/t/5fc3b84d3f75b1664345cb01/1606662221639/33342098158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2df1bf-ed88-4f23-ad83-7b6b5f235d5d/printing_press_impact_on_the_renaissance.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf08a3c02f22b9dd246fa/1606283403461/3670287274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f7184d-f017-4643-8d6b-b006acbba48c/kotefezowipifujuligarivas.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/41739845729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ce5692-e8e5-4a5b-93a9-c106eec94e4f/alta_fitbit_hr_manual.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_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 5120 bytes
SHA-256: 7ceeb9e044f66a96cfde7139374d7f18517e3cfb7675cd222c0ace4313b97423
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 9992 bytes
SHA-256: 7093765e49b97137c13dcb8e4fe5a2571b6bb5cfec0a7a2d9521b154bc5466a6
font_02_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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