Malicious PDF — malware analysis report

Static analysis result for SHA-256 af775f1f03078e4e…

MALICIOUS

PDF

69.6 KB Created: 2020-12-14 01:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9c926bcfd83aea096fe904f8c4edb36 SHA-1: 8b0c232323a52a87788e894da085069ffea1cb0f SHA-256: af775f1f03078e4e5f00ec0908357be77005b2532c3f2f8b797a6ae942bd967f
186 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 6

  • 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.
  • 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://traffine.ru/123?utm_term=the+night+dad+went+to+jail PDF link annotation
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/winenuk.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/5093326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5f9f066850979.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/6796a5.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/6899628.pdfIn PDF document text
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/b89adb09621e1.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/tipugagukal.pdfIn PDF document text
    • https://buxufuniwa.weebly.com/uploads/1/3/4/7/134717035/mezejulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_5fb9274f75c35.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/gozifep/chakravyuha_kannada_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20316731-0346-4f44-9488-0f23e29dc14f/hamilton_beach_1.1_cu._ft._microwave_oven_copper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5acc35-6f58-4bb8-b29d-a79771e0c16c/84809732583.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/3d_photo_builder_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f1f4df-42d1-46cb-b276-33ed6601292e/why_was_catcher_in_the_rye_banned_from_schools.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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 4928 bytes
SHA-256: cdcbe9948463740d9de8c947ddbb5b59f36fb436ea5c62038f0cb6cd4910981f
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 10444 bytes
SHA-256: aed5ab10502562a0d61fcfe810550654627aa0d4db6570e32bbdd1cfa9f8dfb6

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