Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea0d7c42e760146…

MALICIOUS

PDF

74.0 KB Created: 2021-02-21 00:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b45546983ace0bf5ba2a9b152fa0fba6 SHA-1: d25cc815f27fd670403135ea993cfd99a97ebda6 SHA-256: 4ea0d7c42e760146ee9aa037385b2d6d71701863300f41df0deb2bc5f1a47560
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, references 'Dell optiplex 790 sound driver windows 7', indicating a lure to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=dell+optiplex+790+sound+driver+windows+7 PDF link annotation
    • https://cdn.sqhk.co/tirazirevemu/eyBrZhb/9859782515.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/gggeBnp/mishary_rashid_nasheed_rahman_mp3_download.pdfIn PDF document text
    • http://vpntop.info/eggbeater_antenna_planscxiz7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fcf3c0926784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_6023f701e81f6.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/jyC0ghn/2676991435.pdfIn PDF document text
    • http://shoes-storie.club/barish_wala_whatsapp_status_video0elgw.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/eragon_inheritance_book_47wczd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_601737e539bb1.pdfIn PDF document text
    • http://varistop.site/donde_puedo_ver_skamydbht.pdfIn PDF document text
    • http://matras-24.ru/juvevijuvezawutetugopitujxq5o.pdfIn PDF document text
    • http://okrasote.info/muvivetijutemp2xb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_600cf642cbb5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382408/normal_5fccfcc8e8337.pdfIn PDF document text
    • http://nekretnine.site/4710352661294q1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_60183e3b2b286.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/jeIhbhj/art_of_war_tattoo.pdfIn PDF document text
    • http://vakisegu.iblogger.org/tatalaksana_bronkiektasis.pdfIn PDF document text
    • http://fomilexavekol.22web.org/everfi_module_1-_9_final_quiz_answers.pdfIn PDF document text
    • http://itanto.space/bts_hop-_tiles_hop_kpop_music_game_appblyw3.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/fmKibkv/rumewoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vixekufu.epizy.com/frm_level_1_practice_exam.pdfIn PDF document text
    • http://lakuvuzixikix.epizy.com/writing_academic_english_3rd_edition.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5340 bytes
SHA-256: f1ec842c18e402f433f0221423cf2a2a7da5b61cdde92dd4d57f0aad32bd12af
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10488 bytes
SHA-256: 254863c80f248f32c3fd7ce6768b8213223fe03da849a8f0771e074c504e2617

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