Malicious PDF — malware analysis report

Static analysis result for SHA-256 21634e9b4c4956e2…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 04:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 792aa84fb1c20068f2303602f2f9e68f SHA-1: ef2b228be9287719d4e59f29298bd526269d3350 SHA-256: 21634e9b4c4956e2d2c2176377a754e895fece103a7782d3d65f26f9521766e5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious content or phishing sites. The document body text, though partially corrupted, suggests a lure related to a 'Lowes survey page'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/wix?keyword=lowes+survey+page PDF link annotation
    • http://krokoboko6.xyz/kadofumozamojelhx8g.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/peragolajijokasi.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/donuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe961e0de4c1.pdfIn PDF document text
    • https://bezuwodasufex.weebly.com/uploads/1/3/2/6/132696249/0ffbe56ad3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602a714348bc5.pdfIn PDF document text
    • https://tidukunetubuf.weebly.com/uploads/1/3/2/7/132710673/wolitovujel.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/hgji3gc/57309419134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5ff1fceb0d275.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/6147992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_602a2ee9915d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5ff3bbb5ead32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff1575df27b7.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://nejovafejasujob.rf.gd/blackout_game_free.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 4800 bytes
SHA-256: 5729a8314949ab6126c34353975bdffd96fce0dcaf3954f17a2d8837a1efbf78
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 10672 bytes
SHA-256: 979a29d6263388d1145e01ee5fd2625543c471a1e4f518904c87d06d8174a3fe
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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