Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef838760604137…

MALICIOUS

PDF

68.1 KB Created: 2021-03-29 10:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47aea2a9d9469d543be5128b91d4f98f SHA-1: 10df22c439b9f08cf6cca4731f36462458b2c8e2 SHA-256: 97ef83876060413733879934677377710499bfdc03068918309f822f60f2d8ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to inflate search engine rankings. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a campaign to drive traffic to malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8956

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://lozipotod.ru/award?keyword=asco+catalogue+pdf
    • http://nozekem.iblogger.org/85680177034.pdf
    • https://cdn.sqhk.co/xejudawadoni/Qjfhc6s/nawovokemiteder.pdf
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/8917459.pdf
    • http://juniwasobevi.22web.org/70546133369.pdf
    • http://gaxotewaboka.iblogger.org/lisijiw.pdf
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/f2bebbdd.pdf
    • https://cdn.sqhk.co/sojowidaz/heXgggc/dafariderov.pdf
    • https://cdn.sqhk.co/kapokosop/jfjcXhb/jozif.pdf
    • http://sedisifoxe.22web.org/formation_afnor_qualit.pdf
    • http://pozopamux.iblogger.org/vapodawiwulegamejoku.pdf
    • https://cdn.sqhk.co/giboxikewev/hejcyvJ/63161349311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_86af66cc61224c769073e89ccc99d308.pdf?index=true
    • https://s3.amazonaws.com/legenapi/data_science_online_certificate_programs.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_71883558034a4b51a02933b612a0eee7.pdf?index=true
    • https://s3.amazonaws.com/woberiz/mewibibuze.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/37849821949.pdf
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_23346ddd5e8142c6b0acfbcc26adcbb2.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_bf75d0b334eb43aba0c2673846780776.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/gomotofupimilepuzuzot.pdf
    • https://s3.amazonaws.com/megulu/nibip.pdf
    • https://s3.amazonaws.com/xafaxotaful/52312823980.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/jinapineruxuruwivo.pdf
    • https://s3.amazonaws.com/wupuxus/75991387039.pdf
    • https://s3.amazonaws.com/gezizefefififa/how_to_make_gif_on_photoshop_2019.pdf
    • https://s3.amazonaws.com/sugowubuf/77818691812.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e9.bin
86d5e656774499ffb3b918e1cf7d779a25cb72b7e9ab5ae1179ee804ae673833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 5216 bytes
font_01_sfnt_off0000eac5.bin
fe121b8af3f6f71caffc16b01393ccb6e4390b867757ece5375ccda70bdc18c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 10184 bytes

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