Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b69d704f8fc2dc1…

MALICIOUS

PDF

71.9 KB Created: 2021-01-21 12:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d74dcbfade8271d8eb03eb8b5394442f SHA-1: 5067d107f543edab172103836cc8c23a251a0391 SHA-256: 1b69d704f8fc2dc1cf96fb8101c3008517d3d891824beeb7f9ac6d4b6ff33991
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and an SEO redirector, indicating a phishing or scam attempt to lure users to download further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wb?keyword=tank%20mayhem%20game PDF link annotation
    • https://cdn.sqhk.co/silakozafi/baDidSf/jojitosetexixazoboros.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/tijun.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/qgd0dje/meme_vs_rage.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/chZiejd/audio_pro_addon_t5_vs_t3.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/8heSQjf/zedd_the_middle_remix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_5fbdf63b45299.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/iiRa3ta/69306531241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fdf6a5f8d482.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/ZgfPgdi/lusirik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fdba471d4694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494673/normal_5ffdff63a345e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5fa5b8240ffc7.pdfIn PDF document text
    • https://cdn.sqhk.co/jetuzama/1Hienia/3680188695.pdfIn PDF document text
    • https://zuzumapi.weebly.com/uploads/1/3/4/3/134344149/suvazimadefebog-risavun-lukilopofowaz-ponexib.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/tafat.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/Aojeja7/katidowedusadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5fc97f0683e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5f99bc6a9f6e8.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
    • 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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 4456 bytes
SHA-256: 8b6be46d5ce069257a5e3183684535995436641f24a6c6d9ef04fe106a3fed29
font_01_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 11664 bytes
SHA-256: 105fdd12a1a22bfe7d0d4a1bf2ec532a5c152cd4a327809e3cd9c8deb9c5c46e
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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