Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72f2ce6e1f09181…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 19:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 62ba38e4b4ce01824502000fa5048455 SHA-1: 531ea2cd7bde22007ed3684bcec35c901b1c25f3 SHA-256: a72f2ce6e1f09181d5539c1a448bee86b549cea1e04761f1e4de876776e14b95
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://seumenha.ru/wix?keyword=cbest+study+guide+2016+pdf PDF link annotation
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/16312.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/PAgeVgh/screen_time_iphone_parental_control.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/ZjbDBqP/27016000313.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/FVjjgdT/breadcrumb_navxt_shortcode.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/3826306.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/9832794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_5ffb9479e058e.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/vQibjct/busasurotevogibobawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_603ccdf802ce8.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/hbNjfie/neighborhood_watch_logo_vector.pdfIn PDF document text
    • http://keberumapup.22web.org/dobuvugonaxubipon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60127637a8f28.pdfIn PDF document text
    • http://mizolaresunade.iblogger.org/cbse_10th_answer_sheet_format.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/37159372894.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
    • http://zirutabu.myartsonline.com/hoover_powerdash_pet_carpet_cleaner_not_spraying_water.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/what_attack_on_titan_character_are_you.pdfIn PDF document text
    • http://wafowudu.epizy.com/derojesugeguzuxelojiluki.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/bumigidepax.pdfIn PDF document text
    • http://pijularof.epizy.com/towigixobimo.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 5284 bytes
SHA-256: f44b6d39f89f5e7565a587827132eba908f97d57ee86c30bfef945a36522e637
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 11224 bytes
SHA-256: b5ac0d64d1124108691f0cf95a43496f96dea590814ef20735ae392627e6afa9
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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