Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad957d25bb47c6…

MALICIOUS

PDF

88.2 KB Created: 2021-04-21 20:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aca73460f08757adc8586ba5cbc7558b SHA-1: e6ef3bfe8d17bfab0370af3f820d75bdffd38c47 SHA-256: f5ad957d25bb47c6f880b653a8ec9d212bf7ca302c4bcc544a178fc1eb8315df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=manual+de+funciones+y+responsabilidades+de+una+empresa+constructora PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5ff2aafb28f43.pdfIn PDF document text
    • http://kukushpa.fun/how_to_prove_customary_international_lawyyb0e.pdfIn PDF document text
    • https://juwimifabofif.weebly.com/uploads/1/3/4/3/134369341/7863888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_5fe7ca2d1606d.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/eBegh3Y/happy_wheels_mod_apk_download_android_1.pdfIn PDF document text
    • http://stalekost.site/tobipijunaxodfz2p.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/bwhhajg/wedding_cakes_designs.pdfIn PDF document text
    • http://chambrehub.xyz/what_are_the_conventions_of_a_short_film_ideas227pt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_6038f3ef67463.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/18915427743mftoh.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/8238453.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a2daa1-1ff2-4a24-868a-ac17ace10987/examples_of_health_and_safety_policies_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0807110f-1526-41b8-967f-a29956595424/how_do_you_reset_a_hardwired_smoke_detector.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_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 5548 bytes
SHA-256: 709437c0ff8efa6159027f1ef221a2cdd015fb4a07f437a1dd981863623583ce
font_01_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 12060 bytes
SHA-256: 6eac5d65fa9b1a8f6d6340ff05f8bb4b428be553c6ee90393f2f50022de4ddae