Malicious PDF — malware analysis report

Static analysis result for SHA-256 4607f296ed681ab6…

MALICIOUS

PDF

74.9 KB Created: 2021-06-08 23:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c216d58847cf0202d6689b7befbc77 SHA-1: e8c001aa718f16d266a0e0c6d21f3d20256fd9ae SHA-256: 4607f296ed681ab67cf80d616b1991726804fda6034227309ae6685488ab6b2c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The presence of a 'utm_term' parameter in one of the URLs points towards tracking or phishing campaigns. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 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://crewmak.ru/pbw?utm_term=missing+the+narcissist
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/jeloja_pujuto_nurukosew_rulik.pdf
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/8864986.pdf
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5feb9753ae50c.pdf
    • https://cdn-cms.f-static.net/uploads/4479925/normal_6026b01008abc.pdf
    • https://cdn-cms.f-static.net/uploads/4374840/normal_5fd815ca49ab6.pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_604cf164ad8a1.pdf
    • https://daviwajid.weebly.com/uploads/1/3/4/6/134609730/jepejuwos.pdf
    • https://lotisawiro.weebly.com/uploads/1/3/4/6/134625457/kovula-nukisoxoj-xareti-vakiwed.pdf
    • https://fupodakabapamom.weebly.com/uploads/1/3/4/4/134489617/divitanitozasij.pdf
    • https://xifopuwo.weebly.com/uploads/1/3/4/8/134852026/d03e6a6a45.pdf
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/5262540.pdf
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd5f170c2420.pdf
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/6812439.pdf
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/7726454.pdf
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/wejinozufalukuf-lafodev-gekarokobulem-limorukamowar.pdf
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6061635b44833.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tukufidanega.pbworks.com/w/file/fetch/144423096/43465779261.pdf
    • https://uploads.strikinglycdn.com/files/40e43a5d-714a-4e3a-9e0e-fcdd12ae0b36/takapedikolenunimoga.pdf
    • https://uploads.strikinglycdn.com/files/d3cac4af-5c82-43c5-9830-12671eea726a/30_day_squat_challenge.pdf
    • https://uploads.strikinglycdn.com/files/38ae5d5a-d82e-4d81-9b67-578930c8414a/sabife.pdf
    • http://lodenapokot.pbworks.com/f/vanerinumerurag.pdf
    • http://labidan.pbworks.com/f/57958474785.pdf
    • https://uploads.strikinglycdn.com/files/03a5b62a-e43d-4fd1-9953-d4228e57f577/79295126497.pdf
    • https://uploads.strikinglycdn.com/files/b1478d62-a13b-4dac-b476-c634fb00027e/tipos_de_puertos_de_comunicacion_en_informatica.pdf
    • http://posonuxe.pbworks.com/w/file/fetch/144707205/12503284709.pdf
    • http://wikoborumun.pbworks.com/f/canon_f_158_200.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0b.bin
de60161141d0ba5d86b4bedb0742df4728521e16de9f1ed72f5baa57661750b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 5036 bytes
font_01_sfnt_off0000fb32.bin
33f3c1177272746c5ee798534e1574acadbd655968b70e2cb82de20d90ef94f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10256 bytes