Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba45ea66cc487e…

MALICIOUS

PDF

65.7 KB Created: 2020-12-02 18:32:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2277f5d90cc0cbfeccb1f56791429167 SHA-1: 9c81d2ad7bd275288bc2edd687ee2098bc7fc3d1 SHA-256: a1ba45ea66cc487ee57fbc2cd1ab9c548b5e59dfb2449ebb6db0aac3cae68f68
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://trafffe.ru/aws?utm_term=pathology+report+basal+cell+carcinoma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5fb3eabe9ed63.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/mifewigegitinakewil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f9527eda25ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fb8ba1608e2f.pdfIn PDF document text
    • https://firizuvamo.weebly.com/uploads/1/3/4/6/134618899/1546315.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/sixolose/72981814062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d777295-18e2-4268-b72e-66ab772ab2fe/air_force_air_gun_ammo.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/67234462393.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f05df9866f3fd2d48fd4/t/5fc1b85b9ee0f32b87932511/1606531163539/bonogawelofufo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf56a79b1ed03538d21383/1606375081480/11089112786.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c1f3485235c86bcb05f/1606372384060/golds_gym_treadmill_reviews.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd1e0c89e1c4b8fb81223/t/5fc1131d2dd96f591815587f/1606488861846/tufitisakomaxizoxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ba3319-d8d0-40ed-b8ce-c4a7166c11ee/gba_rom_hack_pokemon_omega_ruby.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_off0000c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D6 5588 bytes
SHA-256: 9527c56c26b92284c46291e99f93c644ec204e1503a50c525c50073fac5a2388
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 9852 bytes
SHA-256: 2c69047c365b41acdfe9c3713fe52f6708f0c4a2ef3cd2062255412274bd1448

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