Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd72b01c87c6e6f6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 08:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db156a0d76a922d769cb027c0cdc8197 SHA-1: 5d58e25d5f9c6f5cf6a23f2632b84c3b9abf5bd9 SHA-256: cd72b01c87c6e6f667a9d53a88f664242e35eb4ab5f33b9a3638c006dd098bc4
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=release+plan+template+free PDF link annotation
    • https://cdn.sqhk.co/kofosenolo/3haRP0e/kart_racing_pro_steam.pdfIn PDF document text
    • http://topstudy.fun/91203281480hilw3.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jhChdFK/muzisojim.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/hfuZKO5/my_chicken_2_virtual_pet_game.pdfIn PDF document text
    • http://flash-sar.online/jenodameketanaluj5pj47.pdfIn PDF document text
    • http://trellos.fun/buried_gianto4cpk.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/hihihhl/drift_taxi_warszawa.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovika/heOghgu/apple_watch_series_6_yellow.pdfIn PDF document text
    • https://cdn.sqhk.co/badilapo/n7jiCie/jeninorujofafagelawasar.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/Yja6Qja/15428047871.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/pukagineviutl2x.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://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_4b2fae5492584a6c8be8eb6d2a4e7077.pdf?index=trueIn PDF document text
    • http://tanozetodane.rf.gd/dalugejesunapo.pdfIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_1eaccd39830e499aaf10a6134d539e78.pdf?index=trueIn PDF document text
    • http://vufebadavoga.epizy.com/guided_transmission_media_in_computer_networks_ppt.pdfIn PDF document text
    • http://puxedevonizu.epizy.com/85251843906.pdfIn PDF document text
    • http://muxofitum.rf.gd/fantasy_football_cheat_sheet_rankings_2018.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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 4684 bytes
SHA-256: b1b1fe504cb7d464b542e84606d4892134b8dbc34a3137dd637826210dce17cc
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 11812 bytes
SHA-256: e55f9f0b83203028ab5dadf636702809d5e113aafade12c74fab669aa3e36d98
font_02_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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