Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b300a7503593d7c…

MALICIOUS

PDF

86.2 KB Created: 2021-06-07 18:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 517c9f884230f17b859c1c29c6dbec2e SHA-1: e464c7e97932e7680cabbf6b3e8144c22ac1aded SHA-256: 2b300a7503593d7cd68c7a13e7f48a40c0ead52af20416f5c8dd72c1ba3babf4
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting services, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/123?utm_term=garmin+experimental+solutions+pricing+worksheet PDF link annotation
    • https://nudetotiba.weebly.com/uploads/1/3/4/8/134872476/4232097.pdfIn PDF document text
    • https://gogafijunovox.weebly.com/uploads/1/3/4/3/134322332/7864174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ffa6a734f6c2.pdfIn PDF document text
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/bumafibid.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/5e01d38deb98ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_60b8ae844ae1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_5fe66e3ad0c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fd791ac64714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xemeganavon.pbworks.com/f/vinafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237621df-2314-412d-9d45-b8b0a705c0a5/where_is_music_note_emoji_iphone.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/15592897102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c8221e-dfe0-4813-88f7-5cdb14c254fb/where_is_a_good_place_to_look_at_christmas_lights_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f319f1-cc9a-4620-9dc6-5d4ad491a589/material_safety_data_sheet_form_philippines.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/w/file/fetch/144616308/wekizenot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f95be2-b528-4152-a2c2-5970438eaa4a/vugoxowagi.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144762060/maxakasodeda.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/w/file/fetch/144730800/segufosazupe.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144505329/how_to_apply_for_nsfas_transport_allowance_ufs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2403e76f-d9b8-42ce-a836-b2676b015479/77091563060.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5604 bytes
SHA-256: 050e21192ac2d72d92d23fa676f8fa109c59d90975e4f7a17c4842ab9e57e2c5
font_01_sfnt_off00010d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5C 12624 bytes
SHA-256: 3e561670ea9463513835a9094c6c79a1967e61339f0a867a89ce556ca862e756
font_02_sfnt_off00013611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13611 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501