Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0f0d047c1327be…

MALICIOUS

PDF

64.0 KB Created: 2020-11-22 03:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3cb6e51eb7fc7d9fb4841420fa3e3910 SHA-1: 9b181455b80f64325fd6b01534d9e4685b8fa99a SHA-256: cb0f0d047c1327be657f4dace6bc918398104b80490ffa793bd4423b25294bcd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, including one to 'trafffi.ru', suggesting a link farm or redirection to a malicious site. The document body, though heavily obfuscated, contains text related to a song title and authoring application details, which may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=ammadi+ammadi+nerungi+audio+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fa79133ef526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fae057930f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_5faf7448541e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5fa1107aa68e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fa2162a45b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5f9769cf2a61a.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/b677053b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_5fad2d1da51ac.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/11f2a1f8-43d2-4c3e-a628-de921d862ba1/93595674120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21667f85-02c7-495e-b1f8-60867c31b21c/73213384006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2b099f-6655-442c-a438-40e3dcfbffc2/60518193187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed15ab6e-b5b3-4048-99cc-eb0ea369dc18/pronunciation_of_buspirone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cc64a3-526b-4cd1-a66a-e7d665a301d9/amber_grove_apartments_royal_oak_mi.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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 5104 bytes
SHA-256: 47cfdb543ddba18968b9f11e152f29a40576e596a2a90faa7a2fd9feebc07ff3
font_01_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 10400 bytes
SHA-256: 26b08fc1c417588c72d178097f83b4082482856a35a8fe00e91d2788825c8c90

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