Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5348cc481cbf4b6…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 23:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5070b3c69e863176227e8eb2ca0996 SHA-1: 399566252334088fe6ae1d847ec6601cf901ddbf SHA-256: e5348cc481cbf4b6bcf2f6244820d09c994dc147ebd2e56b5392bc967c5d2e57
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=navy+knowledge+online+active+shooter+training
    • https://static.s123-cdn-static.com/uploads/4443810/normal_5fef6f431772f.pdf
    • http://flymoney.net/661605611761c26r.pdf
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/simigag.pdf
    • https://cdn.sqhk.co/kebokeregim/aLjdHCC/general_motors_assembly_line_worker_job_description.pdf
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/teguk.pdf
    • https://cdn-cms.f-static.net/uploads/4450513/normal_604cca74cf7d6.pdf
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/rafitopom.pdf
    • https://bedaxeribijone.weebly.com/uploads/1/3/2/8/132814155/dugep.pdf
    • https://cdn-cms.f-static.net/uploads/4402000/normal_60421e97c4136.pdf
    • http://tiktokcopyrighthelpteam.com/lugiwop20lj.pdf
    • https://cdn.sqhk.co/wimedizi/ja8gejj/xutibilubob.pdf
    • https://gedobelega.weebly.com/uploads/1/3/4/3/134375191/6d92236de6.pdf
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/4aa91add72c6e2.pdf
    • http://akmurzina.com/sitomegurejwfgm.pdf
    • https://xagofutaruv.weebly.com/uploads/1/3/4/3/134344009/54a196c2a0a467.pdf
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/8081927.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/sokoket.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_879226ca4a8a4c6485563a17a32a09d7.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_b284b04a2f8c462e8b3d9050a271c681.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89b.bin
daecf1bd54b80bb6b29f3bbee21585d90865ab695b0a310edb27b63111e24b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 5488 bytes
font_01_sfnt_off00010b66.bin
fae48123c79d19ae3654e75d4f978eca0ef8ccdec275bbf6a16c46b3b859f11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 10588 bytes

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