Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06e88d4bfbd4821…

MALICIOUS

PDF

80.8 KB Created: 2021-03-30 01:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62eb3b2e2196057d28ac27f8c60e5633 SHA-1: 4bd194f0068265de2fe9641f2acff1b75aff95b2 SHA-256: a06e88d4bfbd482168e0c3bbc5c664604d2d469007acf1b5b7a34b2de1094a9a
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain, suggesting a phishing or scam lure. ClamAV and ML classifiers also flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded URI strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/award?keyword=basalt+rock+fibre+pdf
    • https://cdn.sqhk.co/zuvifilezaja/QxtridY/58035640367.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_605cb1597f336.pdf
    • https://cdn.sqhk.co/bugolajoxodu/XuNgcjb/shredded_chicken_pounds_to_cups.pdf
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fcd2d757aa0a.pdf
    • https://cdn.sqhk.co/nurijodefa/ggnghhe/28772132602.pdf
    • https://cdn-cms.f-static.net/uploads/4484814/normal_602611d0b9c35.pdf
    • https://cdn.sqhk.co/niramojiga/7TYlFPQ/vopusex.pdf
    • https://cdn.sqhk.co/jedepazisu/xjchfhd/fotanudepilivuxobo.pdf
    • https://cdn-cms.f-static.net/uploads/4458618/normal_601801e33c339.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60120f0a2e407.pdf
    • https://cdn.sqhk.co/matezafun/jflhcow/6753112924.pdf
    • https://cdn.sqhk.co/fukafodifi/dgcctji/sky_f1_tv_schedule_today.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_e85b1b5285164e979ec19b2e1b20d3e2.pdf?index=true
    • https://s3.amazonaws.com/sewamos/4598367090.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_241830d5c0fc42d7aaa240c0fff0049c.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_0975ef252beb46ec981a07eaeec2b281.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25361670-b60c-4c4c-a44c-2864a3e4cd81/how_to_use_adobe_acrobat_pro_2017.pdf
    • https://s3.amazonaws.com/gafedupeba/sogasudemunitopuvutikoroj.pdf
    • https://s3.amazonaws.com/jovekus/hart_of_dixie_season_episode_guide.pdf
    • https://uploads.strikinglycdn.com/files/4655baa3-7b9e-4836-ae6e-5fa4aadf95e0/sekinubugosezor.pdf
    • https://s3.amazonaws.com/tuletivotarupu/battlefield_5_beta_ps4_not_ing.pdf
    • https://s3.amazonaws.com/fotepopunaj/the_theatre_experience_13th_edition.pdf
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_22cd3b5d7754475bb48e266a6e1b7a88.pdf?index=true
    • 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_off0000f8e8.bin
c8a129fc0a320fd4e4a6df70ce4e1668484986557fad2cc187aaaaae0aa19e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5404 bytes
font_01_sfnt_off00010b50.bin
4a650e58114098e08e746ecab5988cae45969c741126d81e5ed3ac43077f2d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 12436 bytes

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