Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c876d4b7c28f7…

MALICIOUS

PDF

73.6 KB Created: 2021-01-12 13:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a73507aa28e99ccae0d1f36b3543ff99 SHA-1: 485cc4889c51a137095caea7318dcd0302b5cc2d SHA-256: 925c876d4b7c28f733eea9b767d6bff61af6b9cf250b88c75d8727f2e9d7cd31
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest a phishing or content-luring attack pattern.

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://traffset.ru/aws?utm_term=casada+quattromed+iii+manual PDF link annotation
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/jekubitarekadolibe.pdfIn PDF document text
    • https://cdn.sqhk.co/silutoge/hidhbhg/star_wars_kotor_cheats_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fbed2b6c9e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fb42ed8506fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5fb2bee1f19d2.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/iaSjdge/73012886712.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/bharcra/avion_flight_simulator_free_download.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/612562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fbbbcd4c9cec.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/917572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fbefd4607bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ehaYAhi/xejogu.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/gewuwasi/12375203278.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/xolelivazexufadexegovoj.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_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 5004 bytes
SHA-256: 2900757f4a02302f27e7cf5323566f9ae3e10ec45173cee726ffa421254b66ab
font_01_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 10820 bytes
SHA-256: 3f88c8a267e0e7ed446cc67f5514ad76b5f59d5b2d326025d6856e0fc403aaf4
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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