Malicious PDF — malware analysis report

Static analysis result for SHA-256 266e8da42e932302…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 20:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e48dc16849fdcbec3b8e14b2bcb23a5 SHA-1: 709daa583293edafe912a00a1db0badc96b86131 SHA-256: 266e8da42e932302c51ba0e610d68eb4734683a69afb2d2a0ee17e021bd4e1dd
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, including one to 'jacksth.ru' which appears to be a lure for downloading software. The presence of a "download button" heuristic further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wix?keyword=telecharger+zanti+2+apk
    • http://buybritishcat.com/fios_router_user_manualbveu5.pdf
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/6f8ea0ec.pdf
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/sopetinoguzopik_terovez_pofobugomefe.pdf
    • https://cdn-cms.f-static.net/uploads/4498983/normal_6058652ed764b.pdf
    • http://yewes.fun/busudirauyiks.pdf
    • http://snatural.space/66602442871d41c9.pdf
    • http://twoup-viktoria.online/benjamin_bratton_terraformingzffez.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6030777a6c7a5.pdf
    • http://kozlo.space/nawapunefideq7i9f.pdf
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/374ee6fe21a.pdf
    • http://100p-f.ru/how_to_describe_a_treeod4je.pdf
    • https://cdn-cms.f-static.net/uploads/4368226/normal_603e2b45afc01.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_60170ff9962c8.pdf
    • http://verification-help.com/intermediate_botany_practical_manualuj5wc.pdf
    • https://cdn-cms.f-static.net/uploads/4447497/normal_601af11bbf6f4.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60160717e37b3.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/3853479.pdf
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5fe213662ed87.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pasutiz/moburutorotabibovebodufu.pdf
    • https://s3.amazonaws.com/wulotugadag/srt4_running_lean_at_idle.pdf
    • https://s3.amazonaws.com/xuzakob/zugeguweduradeva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cd.bin
912c48938d535311cd1068dee6c748c5a0b6582321a221c893fc11625dfdc71d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 4888 bytes
font_01_sfnt_off0000f863.bin
ead0bd0e4cd163a82de6a6ea8903d8241455836f8153819c285ce04893b84768		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 11616 bytes
font_02_sfnt_off00011eac.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 4324 bytes

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