Malicious PDF — malware analysis report

Static analysis result for SHA-256 6402fba6ecb5dea6…

MALICIOUS

PDF

83.1 KB Created: 2020-12-21 01:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6360ddd76f2bd521e08f8a2122289d0d SHA-1: 77ac9014078b69535347299cb9fc217a19dfd45e SHA-256: 6402fba6ecb5dea6f0c2544ad67e8045ada608fb7317a959f1de707e1e841f5a
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains or are used as redirectors. The document body is heavily obfuscated, but the presence of numerous links and the ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95) strongly suggest a phishing or link-farming campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=goodbye+my+lover+piano+sheet+music+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5fa23faeb2add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd88296e2859.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/5174982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fbaf91d3925f.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/c1daf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5fddcad978165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fd88e56d8490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f900374adf2f.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/fisifil-kawozaneguxem-vosoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f8e4b05685db.pdfIn PDF document text
    • https://votewisuzub.weebly.com/uploads/1/3/4/6/134605747/432c1.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd76c205b6bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/napisakaluja/microsoft_access_2010_free_trial_version.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_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 5528 bytes
SHA-256: 3a66bae2bec7b5ff7b5ae7ee15dd44e58a08ca69cd193d809f80a75c68eec2d0
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10532 bytes
SHA-256: ba0a4324d862933d7b61b9145ff76a8246b79e1fa1cc1ca75327e63e4e15fac6
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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