Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d371555988f43a…

MALICIOUS

PDF

72.6 KB Created: 2021-01-25 14:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3f19e452501ebe9bf8d29ce5a94adcaf SHA-1: 76770bc0a6ba4522ed2738575deeeaae135f0a76 SHA-256: 04d371555988f43a6951c4449e397dc4ea9318c2a8697e7a7f474423cf42488a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the heuristic firings strongly suggest an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=ayd%25C4%25B1n+esen+album+free PDF link annotation
    • http://presentinsta.online/xopitiriwovesobinimd9.pdfIn PDF document text
    • http://gefaveje.22web.org/discrete_uniform_distribution_expectation_and_variance.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ijhSWh4/prepper_food_kits.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ZNjgp8R/dragon_king_menu_fountain.pdfIn PDF document text
    • http://lienforkid.com/balloon_tower_defense_6_free_apkb0s67.pdfIn PDF document text
    • https://cdn.sqhk.co/medukukekuke/J4QCgdg/76392671041.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/shbhc2f/elemental_dungeon_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/junukexad/jhihnia/begiralilutuzufopogewilu.pdfIn PDF document text
    • https://dapeborax.weebly.com/uploads/1/3/0/8/130813135/2fcd08c5dc.pdfIn PDF document text
    • https://cdn.sqhk.co/pewovixosafu/FgBibhi/god_simulator_2_roblox_codes.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/senodiw/53133177185.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/gezanesar.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/happy_birthday_song_with_name_ravi.pdfIn PDF document text
    • http://gabamad.epizy.com/top_paid_android_games_free_apk.pdfIn PDF document text
    • http://demuremapinob.epizy.com/annexure_h_passport.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/membobol_wifi_dengan_cmd_android.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5316 bytes
SHA-256: c86a3776ffea882089944c695d73118118e1d2f4a8d06c01f5625c5416d92249
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 12884 bytes
SHA-256: d3379a960aa408ad20705fb7f7f288eeb4bd01257f47dadaf3df3343bc16a91d

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