Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bac6922ee1696ec…

MALICIOUS

PDF

89.8 KB Created: 2021-03-28 00:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6722131b28af131c29c355337a61c98f SHA-1: cca08b82a52d2bfbcc078f749b49a9904b0c3532 SHA-256: 9bac6922ee1696ecdfe3aad10b5e1fe9092108ceb35d73b03cd8fc07d2219a16
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to drive traffic to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a dictionary search, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://xezojetit.ru/award?keyword=longman+phonetic+dictionary+pdf PDF link annotation
    • https://cdn.sqhk.co/vaxofalu/j3WhjKY/vakefez.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/geCjcjd/photo_collage_app_download_for_windows_7.pdfIn PDF document text
    • http://trastenmyqort.online/13940839281b9e2i.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/yhakhij/word_with_friends_online_login.pdfIn PDF document text
    • http://deweretiwusoxo.22web.org/que_clase_de_palabra_es_funcionario.pdfIn PDF document text
    • http://fitotim.iblogger.org/vogegulisovaluvepipa.pdfIn PDF document text
    • http://mastericy-chistoty.ru/the_complete_gmat_sentence_correction_guideq341t.pdfIn PDF document text
    • http://resimpub.com/8xoew.pdfIn PDF document text
    • http://formverifiedbadge.com/romeo_and_juliet_theme_song_free_mp3_download3pd17.pdfIn PDF document text
    • https://cdn.sqhk.co/belebudetub/eohiie8/giniboluse.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/GhjjgjM/how_to_beat_trap_adventure_2_level_3.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/zesotat/faperaliruwubike.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/sum-product_networks_the_next_generation_of_deep_models.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/gungeon_synergy_guide.pdfIn PDF document text
    • http://zafovitunopejus.epizy.com/god_loves_a_cheerful_giver_sheet_music.pdfIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_69703da479ab4b9e8746e314f33b3054.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_6cd4cbb99b0443e9b15e10258eddb7f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/android_app_ed_but_not_showing.pdfIn PDF document text
    • http://pofepopogako.rf.gd/does_load_order_matter_in_fallout_4.pdfIn PDF document text
    • http://fakonin.rf.gd/foraminifera_morphology.pdfIn PDF document text
    • http://kiwopej.rf.gd/essentials_of_statistics_5th_edition_answer_key.pdfIn PDF document text
    • http://relilirijupike.epizy.com/wejanorejejez.pdfIn PDF document text
    • https://1437f3f1-f978-4e1b-9120-555090070881.filesusr.com/ugd/d4ef56_cff7f8e64d834fe2bf3b6c0a0e14d9dc.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013bfd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13BFD 18444 bytes
SHA-256: 3ee22f394b462aab0751349b246ec5e2dc0c2c9903b94732fba786bffbf5f5a0
font_00_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 5404 bytes
SHA-256: 5fc2d1bf85c03b1bc1bda2f3b2b9fcb3c00a4efa2ec95cefb9bb461c2f321c82
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 10832 bytes
SHA-256: f9b7112de7662c7c84b4a816bc7c0c832a174d5aa73367d32618f04b6ea57569