Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c54b0d08444e0…

MALICIOUS

PDF

74.7 KB Created: 2020-12-22 00:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1f47a921639291d7f8313fc1581dc2be SHA-1: 9decb9f0480c0f121407516f12f35623ec1b5236 SHA-256: f55c54b0d08444e012d907aea363a0ddcd1e5e9ad64a0719a78b9880fde50bd1
156 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. 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 0.9998

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/123?utm_term=chevy+truck+manual+transmission+conversion PDF link annotation
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/bowupalunuxur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f9ba7162bec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f8ef31feff1d.pdfIn PDF document text
    • https://jomojakadawubo.weebly.com/uploads/1/3/4/4/134448567/02de5ac7a82266d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_5fabf4e560955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5f998ad9d45c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f88be5f1d189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b1dcba00.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/ruloda.pdfIn PDF document text
    • http://www.9ku.comIn 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/d51db909-cc35-438b-a404-19452f1360f3/leriwabapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7790ea-7357-4cf0-b428-2bec1000cd2b/85817020312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6ef03b-0b3b-4087-a710-934ef371492c/vamogelakapozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd011209-c647-45f3-83ac-09b0fc0c877d/xigitebapazikekepera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c87a249-672c-47cc-a37a-de1cee107b80/kojaxuwapisemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c918aa22-e6d7-4d03-9195-0813ec55436c/xazomajixatuwanetuteduxob.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_off0000c58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 10660 bytes
SHA-256: 7255c63f94668c3a8216b3d0b89f22f3f827d34258e00fb12a04f9810e0ca650
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 5168 bytes
SHA-256: dc44317408399c14b57846b5efe32d924fdc67139406db2ea4c61d4ba194f849
font_02_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 10348 bytes
SHA-256: b34f388fa7331de9a74c1324760d497044dfb2f346d52a332d18ab777e681226

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