Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3edb9f5f0cf673…

MALICIOUS

PDF

85.7 KB Created: 2021-03-04 01:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e2e403c736a2ea4113f3204b57e4d50f SHA-1: d0e15c3d3dea3471106b7cc0ebe300f4b1b8f894 SHA-256: aa3edb9f5f0cf673cd7a445a7c0ecd8ee22060c381731a3071e33e6c64b1ae6f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://zajinet.ru/123?utm_term=pretty+little+liars+cast+season+2 PDF link annotation
    • http://nevinidonet.mywebcommunity.org/marketing_management_class_12_case_studies.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/is_project_management_a_good_career_in_india.pdfIn PDF document text
    • http://evatopshop.xyz/regogoviris4qyig.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/what_car_seats_are_compatible_with_graco_ready2grow_stroller.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/ibjdmig/31911174039.pdfIn PDF document text
    • http://indital.space/ralapufis4teyq.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/NUhfjgR/pemelufofepep.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/fNhdwhi/gazipa.pdfIn PDF document text
    • http://xoxinusenavi.66ghz.com/agrobacterium_transformation_freeze_thaw_method.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/ciehbgi/this_week_s_top_100_country_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/iijAhPp/aliexpress_human_hair_wigs_short.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/LLgdjc9/kevebajunodar.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/dunoduzebevowe.pdfIn PDF document text
    • http://yoga-italy.space/lufowuqx6sd.pdfIn PDF document text
    • http://legiontry.online/how_to_tell_if_google_maps_timeline_has_been_altered6cgjj.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/tar1gia/kozugavidufizadarolekolaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sinusisokopex.atwebpages.com/xefilojunijakokipuvidatof.pdfIn PDF document text
    • http://nokudumufax.rf.gd/diagonal_canonical_form_matlab.pdfIn PDF document text
    • http://gozipoxux.rf.gd/breast_cancer_screening_guidelines_nhs.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_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 5028 bytes
SHA-256: 4a33d4c7c8a8fca11e2b1502e4b94f71e299fc9446839a5c87ba28b5a41743d4
font_01_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 11008 bytes
SHA-256: 6ec4912ff063d5f970f9664a4181e391a7819ee7996342f4b5aba3826ba36b44

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