Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7b31602b0baf98…

MALICIOUS

PDF

62.9 KB Created: 2021-01-30 14:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fac149af7d4d53814f68f8d6e94111c0 SHA-1: ec2a3f3534e551154ce44415d38cb215d99ac463 SHA-256: ef7b31602b0baf9862b8e36342f08df1ff949889be3f31ab60930ccf212793b6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links pointing to other PDF files hosted on various disposable domains, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/aws?utm_term=bes+m12mi-+psc40b-+s04g+datasheet PDF link annotation
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/wotanonapilojo-jubesivuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_600cf155f3318.pdfIn PDF document text
    • https://muwilumi.weebly.com/uploads/1/3/0/8/130813533/najilezim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fe974b5103ad.pdfIn PDF document text
    • http://fishland.store/donumoxobokidese59o8j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff23676ebdb8.pdfIn PDF document text
    • http://fitokaps.xyz/lawasuliminobl8wg.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/daboriruza_kememegofax_sumifedofen_liseperulikezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fe26c75b163e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf059ae7128.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/2242520.pdfIn PDF document text
    • http://swiss-family.space/430433393963x4hr.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/j2gcjfP/5721408815.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/naxilivixefudajil.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/55ec9d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 5996 bytes
SHA-256: a74d00614acec232966db42f8e4c3da90aef399ab3cff189a5a0144c7a95e3cc
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 10296 bytes
SHA-256: ff46303a6d512b370203546e77e73bda998f817060a4dae414849f4469553570

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