Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef077411e899774…

MALICIOUS

PDF

92.1 KB Created: 2021-03-25 13:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3e1a943ee8624fe23572df2d946ed904 SHA-1: fa6741fdbb6407050035f8a6fc426f0c3dc76c40 SHA-256: 0ef077411e89977421dd048cd09dcdf031268ee4d3393e25893cd9ee31d5ccc1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were directly extracted, the presence of numerous external URLs indicates a potential for downloading further malicious content or redirecting users to phishing sites. The document body is heavily obfuscated and contains metadata related to PDF generation tools.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=capillary+electrophoresis+applications+pdf PDF link annotation
    • http://zijafanovidiz.sportsontheweb.net/apostasia_en_la_iglesia_cristiana.pdfIn PDF document text
    • http://mif-smeh.space/avatar_full_movie_filmywapyh63j.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/jesorane_sofeba_vogukefumek_vulimoparesori.pdfIn PDF document text
    • http://carishr.com/kuta_software-infinite_algebra_1_answer_keybqwai.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/hdj8A5T/bidavinovuvizuwubemasavew.pdfIn PDF document text
    • https://cdn.sqhk.co/melobokodijo/gigjejh/14510462134.pdfIn PDF document text
    • http://tehnopolis.org/easy_piano_christmas_songs235vv.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/Sl6ghDS/nenamam.pdfIn PDF document text
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/morukuvitel.pdfIn PDF document text
    • http://sweetmeet.online/fubajufepo8vvma.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/e6ad315a137ba7.pdfIn PDF document text
    • http://dezlice.ru/fluke_337_user_manualtwbmv.pdfIn PDF document text
    • https://lozakojetewije.weebly.com/uploads/1/3/4/8/134891862/241a7fa86de5.pdfIn PDF document text
    • http://tufusojakigun.iblogger.org/the_expanse_season_4_episode_6_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/d8Igfif/tennis_ball_shooter_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/phdidhh/43212925847.pdfIn PDF document text
    • http://businesslinecenter.com/siemens_plc_price_listt9xq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megisaduvivegi.epizy.com/bongo_music_audio_free.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/93743477678.pdfIn PDF document text
    • http://pesipobigon.rf.gd/symbolic_interaction_theory_in_education.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_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 5248 bytes
SHA-256: 358be44732f7b760b3a9c120b6a879fca40311717a5a0fbc7ebd4c8ba720fdbb
font_01_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 13548 bytes
SHA-256: 6ef32ccf58729d854bec7f915845761dc4f98fe75528bde7d2f10eacd0481218

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