Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcd46bf12bab186…

MALICIOUS

PDF

70.8 KB Created: 2020-11-11 03:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d153564f6df126edeb09ed63da6ccaa SHA-1: 147b60e4c54016b25b36e2bb6372c44b6f1e5702 SHA-256: cfcd46bf12bab18641e09ed3b0888192cfa93336ce075ecdbd2aa098248a31c2
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 0.9997

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://traffine.ru/aws?keyword=dynex+42+inch+tv+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5f97e4b4c4c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5f9a3f518c3a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5faa213053911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5fa5acbc57aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f9a468cc1e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5f9e35bfa650e.pdfIn PDF document text
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/zemonaxamago.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/d076523b-3347-482a-a082-fd8f18b53d47/numelolupefegefa.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jerarezinurajosikese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52667ed-d3e8-4686-a91f-e205a28cc44c/kelapadoponuziwu.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/free_sample_recommendation_letters_for_job.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 5216 bytes
SHA-256: 26860585b70cc7adbfda663bdd79bda997a333eb68ce9807a73d1fec1b572ae4
font_01_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10812 bytes
SHA-256: 005ad615f7326d2cc45bb13778b261aff0f27fc86adbd1539786ef3e73986eab

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