Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ad3f4e7439d687…

MALICIOUS

PDF

77.2 KB Created: 2021-03-09 10:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f7fea76532409983c2a4622b786f0862 SHA-1: 2020781c322707df5719acb01c529830edf7de1f SHA-256: a3ad3f4e7439d687e963b4e7ca640e43ff94f899c3fcb859ab4772fe08b7da0d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing lure for downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=throne+of+glass+audiobook+download+free PDF link annotation
    • https://cdn.sqhk.co/subilikiwi/hE2Q9ii/purabibakipom.pdfIn PDF document text
    • http://waliduv.mypressonline.com/what_are_bullet_points_on_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fcf3b8f432cd.pdfIn PDF document text
    • http://romeital.space/dell_inspiron_570_power_supply_problems0g3ds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496605/normal_5fe0d0c7dfa34.pdfIn PDF document text
    • http://parralax.net/technivorm_moccamaster_kbg_59616_canada1jc0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_5fe72c07b278a.pdfIn PDF document text
    • http://bristol-yalta.run/tejipeposaponoguqukw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_5fe99c6249423.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/all_in_one_english_communicative_class_10.pdfIn PDF document text
    • http://circus.market/fekokuneferigabodifares6fhc.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/how_to_reset_dtc_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/2vmii1S/diced_potatoes_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/dn26gp3/6757406193.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/iEjagd2/hideaway_at_royalton_riviera_cancun.pdfIn PDF document text
    • http://tortomsk.ru/wefukijatexoy2lxv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/36e7c691-e243-414e-9100-77b79fb726a2/how_to_service_a_nordictrack_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e23f7ec-2959-47ff-ba11-0c0d841b7355/97381008760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5627a950-0a12-4eca-be8b-63bf3ce397f6/what_does_msm_do_for_your_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7214b102-93a7-4703-8a19-28c6b1d8aec7/husqvarna_emerald_118_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8848cc4-7083-4a61-919e-0b1ac4753bfb/what_are_the_different_types_of_ceiling_textures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5216 bytes
SHA-256: 299f95e62d7152f02444e991aea0317d908450cef443304e9c369cb525d5bf65
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 10160 bytes
SHA-256: 1879bb929a432df6dd2fe02bc11338c24d00702aa93a146425fd512afb2c31cd
font_02_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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