Malicious PDF — malware analysis report

Static analysis result for SHA-256 943590c9b67313d5…

MALICIOUS

PDF

85.4 KB Created: 2021-03-31 02:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8b64a3b15a6127bba2e3ecfe97e0a6df SHA-1: ee129090c4ea4b51af28c0d36e74c07df4ee3904 SHA-256: 943590c9b67313d5357b5c74c0922f94ba7978f2b0803b3f8c554d213197c4ff
126 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, suggesting a link farm or redirection mechanism for malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=recreational+activities+definition+pdf PDF link annotation
    • https://cdn.sqhk.co/towevefizub/fggNWgg/46657680862.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/Hhf7hcu/2nd_grade_math_problems_subtraction.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/jigixjg/alaska_wallpapers_ghana.pdfIn PDF document text
    • http://italy50wow.pro/wuvimajutrsmtx.pdfIn PDF document text
    • http://rezltml.xyz/how_full_is_your_bucket_childrens_book9sjfw.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/is_elevated_blood_pressure_safe_when_pregnant.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/27207986455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444115/normal_5ffde2adadb34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366982/normal_5fe40c9fd913f.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Cheghe9/game_ninja_and_zombie_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_60320038bd7ff.pdfIn PDF document text
    • http://gmetry.online/gimowaligasulocxmjl.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/icao_annex_14_volume_ii.pdfIn PDF document text
    • http://pokupka.space/bible_trivia_multiple_choice_questions_and_answerso1gyn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fc7394fdb953.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/konadinivogosezo.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/gjEsPL5/nunovukinidamulitumepujeg.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/tapelu/fimata.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/frankenstein_1818_text_chapter_summary.pdfIn PDF document text
    • http://rejamokag.rf.gd/letter_of_credit_procedure_in_india.pdfIn PDF document text
    • http://levaduru.epizy.com/hewan_vertebrata_dan_invertebrata.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/mercruiser_service_manual_16.pdfIn PDF document text
    • http://xupezewusipoja.rf.gd/kufidafunasurowajuvabines.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/cushman_and_wakefield_dublin_office_report.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_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 5216 bytes
SHA-256: d533fefbf73cb946bb7d9f814664aa911bec87b2a6aea19deec1caeedeabbaf9
font_01_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 10964 bytes
SHA-256: afda908f236f6b8996a1cdec57b0144034946b63a7e77d25b0cb3fe3b42258ae

Open this report in the interactive analyzer, or submit your own file for analysis.