Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ff4aa838d2176e…

MALICIOUS

PDF

85.2 KB Created: 2021-05-30 04:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9958c7592235e87fb0bb8210fd0146a1 SHA-1: 741eb045b8b4673f7ef5ff1bf3873eb93e10ad49 SHA-256: 62ff4aa838d2176e8a79684ccf295934f2f2b968f0f42b098c81adf9c0d3538b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO manipulation scheme. One of the embedded URLs, https://seumenha.ru/wb?keyword=is%20it%20ok%20to%20wear%20black%20to%20an%20afternoon%20wedding, is likely part of this scheme. The document body is heavily obfuscated and appears to be generated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wb?keyword=is%20it%20ok%20to%20wear%20black%20to%20an%20afternoon%20wedding
    • https://zugufavowi.weebly.com/uploads/1/3/0/8/130874222/jotorafaxo_pamebo_sivelujemazugo_voxopul.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/pakulegumowodivaze.pdf
    • https://cdn-cms.f-static.net/uploads/4443574/normal_60248aeb4feda.pdf
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5ff070d4edbf7.pdf
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/2989541.pdf
    • https://cdn-cms.f-static.net/uploads/4415742/normal_60236499a4c59.pdf
    • https://cdn-cms.f-static.net/uploads/4424013/normal_605ab69d3e561.pdf
    • https://tupezufowosen.weebly.com/uploads/1/3/7/5/137500557/822965.pdf
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/6484850.pdf
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/6511612.pdf
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/6800600.pdf
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/9275c1a4473722.pdf
    • https://pigakuri.weebly.com/uploads/1/3/4/6/134684466/kobodemasopugafef.pdf
    • https://cdn-cms.f-static.net/uploads/4479470/normal_6034327661c21.pdf
    • https://cdn-cms.f-static.net/uploads/4496812/normal_60694ef20d03c.pdf
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fcbaa4bcb563.pdf
    • https://gixifufu.weebly.com/uploads/1/3/3/9/133999878/dapugupapotixu.pdf
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/6923131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46161e07-ecf9-4ec7-902e-83df522b5e8b/air_force_1_white_red_metallic_gold.pdf
    • https://uploads.strikinglycdn.com/files/c5b3e22b-4554-4f49-a0d1-9dea6c3152ba/29210095465.pdf
    • https://uploads.strikinglycdn.com/files/faeaa290-3682-4d82-8e87-679441d2d214/the_best_things_come_in_threes_quote.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_off00010cc5.bin
98007c7ca2c0d94f395b20b14c5a42d409cb35b5d4be42d511e4ac4ee4a9860e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 5420 bytes
font_01_sfnt_off00011f62.bin
3eabb43b2e5ef440a937a07711498f14c4b8f5ca6970a5284a33481b46a1231b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 11096 bytes

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