Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda33cb97ca99987…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 10:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 092fc89e75d0b70d78d17a07199f0f1b SHA-1: 2132cef153e28a7589c7f6ec9975fb182dd6f303 SHA-256: bda33cb97ca9998775d4f4d3fec88792bfd85075c9a4cc6f19bc896a54eace26
194 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting itself as a job application to entice users. It contains numerous external links, many hosted on disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=assistant+engineer+civil+kerala+psc+previous+question+papers+pdf PDF link annotation
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/ffcc514d8.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/bjh8Lhc/60979953789.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/norezubirejojipur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_600293727812e.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/H7jhjf0/quran_online_english_language.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/digIjeS/roaming_turn_off_sound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6022eaf9493ef.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Mgg66hi/bubble_pop_game_free_online_games.pdfIn PDF document text
    • http://jakor.pro/la_casa_de_papel_tabwfzic.pdfIn PDF document text
    • http://heliusdesign.ru/rock_band_4_not_finding_dlcupsdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5feb0748addf8.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/keniguwet_zeviwuruzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60378d51bcf08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_f10be3efd676431a897a4feff923f9fb.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4964686c44e64163b03e23ffdc19d9a8.pdf?index=trueIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_e26118a530a845d9b6a62dbc0d3ae8ea.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_50972fbd3c0341efb8db6c732d0a34b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/79723036639.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/wutebuluf.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/papiwemekivil.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_38055f4c91874c30bfece58ba053c019.pdf?index=trueIn 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 5564 bytes
SHA-256: ca3be60378e88b41ef383cc7485726f646c3453d3b492c4567f4aa1e707e626e
font_01_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 10620 bytes
SHA-256: e3990b0aab43bfa585899655cc6a68634d08738949e8052a915065fbda74677f