Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4b663e460ec8c…

MALICIOUS

PDF

82.0 KB Created: 2021-02-22 06:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 109733b7a7e1b6ea8c691ede3d778d81 SHA-1: fd988ae954594cf0855b8afe4ab881bce4874e44 SHA-256: 64f4b663e460ec8c188869bd4cda1ffd03a3064b3789c4fa0e4d8dbf17ce78ca
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/wb?keyword=mamiya%20c330%2055mm%20lens%20hood PDF link annotation
    • https://cdn.sqhk.co/sudizatase/jdnjfet/66898402057.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/Ywghjc0/mccormick_poultry_seasoning_turkey.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/bulum.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/Jwljijj/52965648406.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/vhfnUjb/tent_trailer_propane_tank_holder.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/ggnNjjR/76320752903.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/jb3hj4r/45830211760.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/1sicmjU/multiplayer_racing_games_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/3csUgiM/hideaway_pizza_edmond_oklahoma_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dujepav/a4_label_template_14_per_sheet.pdfIn PDF document text
    • http://gipizaz.rf.gd/punjabi_hit_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/secure_vpn_apk_uptodown.pdfIn PDF document text
    • http://jalozuxir.rf.gd/minions_movie_2015_free.pdfIn PDF document text
    • http://xovojiga.epizy.com/xewewudowuw.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/weather_report_india_vs_south_africa.pdfIn PDF document text
    • http://xutugaveteselul.epizy.com/88249618854.pdfIn PDF document text
    • http://nanisoz.epizy.com/google_image_search_android_gallery.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/xedokodevetemoxexerejig.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/latest_reporter_vacancy_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 5328 bytes
SHA-256: fb55b32d676d6f9e636197c344aefbf917d4ec65398b0de107a19d0cd5adff2a
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 11396 bytes
SHA-256: 3ba46efb948da05395ac0dbe23b4b0413023bf9d5875a71e71d7c9796da4472a
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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