Malicious PDF — malware analysis report

Static analysis result for SHA-256 1536854ce261395f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 05:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3006360f55fd7a34f665f7f312476ae0 SHA-1: 2f0c8b3bca70991f6eaf084aa24e56c1cf7ca3dc SHA-256: 1536854ce261395f00b09d6047f0080f8ce68a64bb58f0d698188e6024784d14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The primary URL, 'https://nipisod.ru/wix?keyword=1988+unis+folding+bike', suggests a keyword-based redirection strategy. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=1988+unis+folding+bike
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/4692699.pdf
    • https://cdn.sqhk.co/kagelemovo/h3hbiie/49394996306.pdf
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fedb9665c70b.pdf
    • https://cdn-cms.f-static.net/uploads/4404739/normal_600a4b71342d7.pdf
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/kekuzirawoful-balixatisa-viwef-guzadamoxumog.pdf
    • https://static.s123-cdn-static.com/uploads/4453117/normal_6005da9e7c5b9.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/zozerem.pdf
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/3f9e3d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4492600/normal_603d355bae017.pdf
    • https://static.s123-cdn-static.com/uploads/4413002/normal_5fde83b56ff59.pdf
    • https://cdn.sqhk.co/xonipavu/idgeWm2/asana_ipo_stock_price.pdf
    • https://cdn-cms.f-static.net/uploads/4408851/normal_6030ead91447a.pdf
    • https://dopilefuma.weebly.com/uploads/1/3/4/7/134733068/suzewum-lepinota-zomes.pdf
    • https://cdn.sqhk.co/kisesawaropo/jcojgMd/73419746998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/42da86c8-9b61-4ba1-9630-b37c2b1be481/star_trek_beyond_imdb_parents_guide.pdf
    • https://uploads.strikinglycdn.com/files/a5f273e0-1f65-467a-8fa2-d8cf86ba642f/zurufamudanidakugiw.pdf
    • https://uploads.strikinglycdn.com/files/57f0d3ee-4d76-43c2-91c0-e66fe0076b16/zetusudejunuvofev.pdf
    • https://uploads.strikinglycdn.com/files/f603e8a8-663d-4a4d-bbb0-d90f04c23a19/the_yearling_restaurant_and_lodge.pdf
    • https://uploads.strikinglycdn.com/files/d43e50c6-3c79-4afa-be13-4cccd973a697/what_are_examples_of_suffix_able.pdf
    • 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_off0000efa3.bin
34a6931be675185876b6dd84ccad3fbf79fe8553112955bb65f115c09ce7541c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 5280 bytes
font_01_sfnt_off000101b0.bin
f92b54e190de77d12eb0047865899d76db91db81f3de60448b41a21224080e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 10844 bytes

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