Malicious PDF — malware analysis report

Static analysis result for SHA-256 08648e1ef4e60f54…

MALICIOUS

PDF

83.3 KB Created: 2021-02-25 15:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 64e7acf8844c4cd80f1048b18543ef69 SHA-1: cfde2fc5687fdc35383629681f1b52eee0714e50 SHA-256: 08648e1ef4e60f544f1a937c80364b7587c19f1ef9a004370e9af182997d29e7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=most+important+topics+in+physics+for+eamcet PDF link annotation
    • http://zinekob.66ghz.com/77466152100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421788/normal_601e3b7382215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418575/normal_6006a822875bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5feb9a75b4d98.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/hhf7Ior/retro_arcade_games_machine.pdfIn PDF document text
    • https://kumisorulilinim.weebly.com/uploads/1/3/4/7/134750082/gowelat-kokute-basoxiwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5ff46c945f2db.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/cjgiadV/samurai_robot_car_transform_robot_wars.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_601e3f79dd66a.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/bxm5Dgd/89617557828.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/f4951a35bb4.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/659KAja/golf_hitting_net_and_mat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimomog.rf.gd/20624513837.pdfIn PDF document text
    • http://bajivuselome.epizy.com/71483938507.pdfIn PDF document text
    • http://rifezovepon.rf.gd/gonuvilomejamevidimewe.pdfIn PDF document text
    • http://xijidejejinenoz.rf.gd/playing_with_fire_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/zemuvobifozobipemakisu.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/ae-_500_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/chef_s_choice_knife_sharpener_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 5328 bytes
SHA-256: 9b2ba5683f229f4df74cb5b53faaa9a904fde12bec1d3707b6de2990bb2bde79
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 10976 bytes
SHA-256: ffc446ae651c63404920279a17a62bef4440b78c69474e406344277572b223ae

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