Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4fd9ff2ab81b1…

MALICIOUS

PDF

82.8 KB Created: 2021-03-03 17:09:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32a8016ff447fb12fd1acba7dd0ee9c3 SHA-1: d7c4632360888d326a982807214417335d997d09 SHA-256: 9bd4fd9ff2ab81b14692faa604c25d64bf91289a8ef6c4e48ef455d81e9f1a6b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one pointing to 'nipisod.ru' with a search query related to appliance repair, suggesting a lure to disguise malicious intent. The PDF also hosts a link farm with 30 external PDF links, likely for SEO manipulation or to distribute further malicious content.

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://nipisod.ru/123?utm_term=how+to+repair+lg+washing+machine+drain+pump
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/7423705.pdf
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ffcb29900d51.pdf
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601b74ca0e99c.pdf
    • https://static.s123-cdn-static.com/uploads/4366664/normal_5fcb6fd08f2a0.pdf
    • http://profmaster74.ru/the_magicians_book_reviewyx1af.pdf
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5ff65147d1656.pdf
    • https://cdn-cms.f-static.net/uploads/4457848/normal_602e9c7ea95f2.pdf
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/8d2be8de.pdf
    • https://static.s123-cdn-static.com/uploads/4466173/normal_60009003e1646.pdf
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5ff28e0b79466.pdf
    • https://static.s123-cdn-static.com/uploads/4377095/normal_60021aabd09c5.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/8637207.pdf
    • http://1xbet-football.fun/zalade89yu.pdf
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/6d5b8df.pdf
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff6ace65c1e5.pdf
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fc79c04b240f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001080b.bin
ca1dcbc4fdb3a6603b1570517b6f9b9852ebe5325ed5e32975bd45cbeee3eb3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5540 bytes
font_01_sfnt_off00011ac3.bin
214e8fcbce22f1bb1d905d3efa642c08b29d0237a12c6e939bd5d5bd9b6b0121
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10324 bytes