Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43385f6a74b6a39…

MALICIOUS

PDF

81.6 KB Created: 2021-04-30 01:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6657772120ff0b13cdfc6d39070829a SHA-1: e2800f9c834f9aa0b990e510e51fe5626ea78588 SHA-256: b43385f6a74b6a39f1af1937fb0e4ffb6586f18e65ae1bee32c771aa7c351ae2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=are+gmat+prep+tests+accurate PDF link annotation
    • https://cdn.sqhk.co/molodomo/nOge1UZ/41030409526.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/sovoxerusitujeraw.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/godinixizopimolafifut.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/kedusoj.pdfIn PDF document text
    • http://gikedipe.22web.org/livro_administrao_da_produo_2_edio.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/dhhhipx/bigo_live_connector_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/hd9ghmf/good_street_racing_cars_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/ginovolox/iI0gllP/67161176745.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/94069415921.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/iji2gje/acdsee_photo_studio_professional_2020_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewadomi.myartsonline.com/woxozikegu.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_c7e84e930eb249b1882d8a1d2a62dd32.pdf?index=trueIn PDF document text
    • http://posofopi.rf.gd/how_to_do_financials_for_a_business_plan.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_1814006b64a8426ba5687d4b194418eb.pdf?index=trueIn PDF document text
    • http://febuzoremasovev.epizy.com/wigifevuxo.pdfIn PDF document text
    • http://judewal.rf.gd/envato_ppt_templates_free.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/android_oreo_minimum_ram_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/jofaluvajafun.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/rexazumirudesugagamamol.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/song_of_solomon_2_kjv_commentary.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_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 5208 bytes
SHA-256: 5e9994fd8eb0eaf25d8ac6e5052c9af6a54497eab5d0a2fbc7d0847d57b44030
font_01_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 11660 bytes
SHA-256: fd5e0bcdc6da74d6740d538ea830d10e09efe7c7c1efdbba402378dfb36babb5

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