Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14ad41cf8db559f…

MALICIOUS

PDF

71.6 KB Created: 2021-01-10 17:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c6a788227f26454ee96964a66de8965d SHA-1: 090b67416b4c9e9691ac6af2fcece7abf940d140 SHA-256: a14ad41cf8db559f07722196a9d1ed980cdb83d7a21c4dbc4618acb98207aa80
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 a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or content-luring attack pattern, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=blue+jean+chef+cookware PDF link annotation
    • https://site-1168191.mozfiles.com/files/1168191/56462122886.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/ibnglos/pool_break_3d_billiard_snooker_carrom.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/9899005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5fae9d758d30d.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/MiifhVL/banana_kong_pc_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465262/normal_5fa8bd066cbb8.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/tgdhjjg/8188732925.pdfIn PDF document text
    • https://site-1174313.mozfiles.com/files/1174313/xajotoj.pdfIn PDF document text
    • https://site-1201036.mozfiles.com/files/1201036/80094397656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_5fbcc7a21539f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_5fb5081f132f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fa0561a2f1f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 5072 bytes
SHA-256: 3b8ffd716f05551773f0264da0b8bf886e64cef15ac16b872b6efdf8a2b4f5c0
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10948 bytes
SHA-256: af8b1dd9958e104445549477c303306c157ac69785a7f0aafa58326360fb261e

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