Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a46dc5a25e004cc…

MALICIOUS

PDF

73.0 KB Created: 2021-03-23 01:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3d8a1e66f85a8551f39b01e7661db78 SHA-1: d0e3fa8c9215d859bb52e445850ddd1b5a17375c SHA-256: 1a46dc5a25e004cc7a0144c161a53b0203ceb37b8f6399dc727d53f01b40b9d6
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam tactic to redirect users to malicious sites. The embedded URLs and the heuristic firings strongly indicate an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=abceso+perianal+pdf PDF link annotation
    • https://cdn.sqhk.co/totafeta/hfWjg3F/faze_orba_trickshotting_map_code.pdfIn PDF document text
    • https://xavamukunakupa.weebly.com/uploads/1/3/1/4/131437969/melozovivo_xiletojodag_xadebodow_resuridola.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/cgjhbhi/juicy_fruit_snacks_vr_height.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/gRhhiIf/behmor_1600_plus_manual_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hcN4pha/mydigi-_fi_smart_smartphone.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/jcNgigc/war_dragons_blog.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/fawinaru.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/heterogeneous_catalysis_in_practice.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/82cb77e5a49f.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/4a2a0474.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/pitut-lirotegukirowa.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/hampton_bay_window_air_conditioner_not_cooling.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/air_force_academy_head_football_coach_salary.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/adenovirus_konjonktivit.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/metakiwasuwowutivibo.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/85537059845.pdfIn PDF document text
    • http://pixujuxe.mypressonline.com/kiwixotuba.pdfIn PDF document text
    • https://sofupikibir.weebly.com/uploads/1/3/5/3/135302021/gakadaxapepezuv.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/bacterias_fitopatogenas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/lidosoruxijupapuvavabo.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/graphics_design_tutorial_point.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/682771919.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/supisasabakedupusikanozab.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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 5276 bytes
SHA-256: e7fe4d87b45a7a228c4c4c770ce67f3e6f1c202c5ed6ef9856fbb5b9c57ef981
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 11968 bytes
SHA-256: d5c55241cee592b5de4fee283b14fca08e4e5e346728015441e2d2b3b17f54ba