Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3d882e07001bee…

MALICIOUS

PDF

73.4 KB Created: 2021-02-08 19:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bc4de35ed54e839931e1050d436728fd SHA-1: 99d5620af4c055e4f838542bd674e48ffb5c4bc2 SHA-256: 9c3d882e07001beeb541048dd9d4d57a56c72ec789c53d6adbbaafd3962f5c2f
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a "download" lure further supports this. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=risk+matrix+template+free PDF link annotation
    • http://org-fruit.space/844508632418homz.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/Zhiagfa/wallpaper_hp_samsung_galaxy_a01.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/uhjHhfo/zombie_shooter_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kezulegol/Qrygehj/como_jogar_pigeon_craft_online_no_lucky.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485454/normal_5ffa53b1120ee.pdfIn PDF document text
    • http://opit.space/bandpass_box_blueprints9el7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_60126dc9234d3.pdfIn PDF document text
    • http://mignonette.space/is_64_bit_processing_faster_than_32s7yc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fd6323d5f903.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/hjfjdF9/nuzogadalazelemalolo.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/TiguK4e/dumb_ways_to_die_plush_videos.pdfIn PDF document text
    • http://disclosures.space/slope_activity_worksheetvzwu2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwosil/android_studio_fragmentcompat.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/44787835839.pdfIn PDF document text
    • http://jipidabaxepej.epizy.com/acca_member_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/formation_chaudronnerie_soudure.pdfIn PDF document text
    • http://mirivukavezigo.epizy.com/46039672224.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/26669556830.pdfIn PDF document text
    • http://fedokow.rf.gd/kewimo.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5184 bytes
SHA-256: abc2a55722e477767b1d95875237de41984b48ba89f82d9cf4a5f7510bc8a586
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11024 bytes
SHA-256: 26407fb4b2062fb37a9dbd32681352e9f45f67863291c10f08d024b540e6c04b

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