Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad86eef632c48a9f…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 05:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f756563024a47763ad68cb3d30e61653 SHA-1: dfec28c95dafadf02d4c2bc27e9b7c5dad2359e8 SHA-256: ad86eef632c48a9f5b5ceaf0df628c40492b08a615e907fb41b203bcb6174b13
186 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. 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-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://zajinet.ru/aws?utm_term=is+stock+market+open+today+veterans+day PDF link annotation
    • http://kikababono.mywebcommunity.org/jutodiwararijusobu.pdfIn PDF document text
    • http://wizomokupelew.iblogger.org/baumatic_dishwasher_manual_bdi632.pdfIn PDF document text
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/28a6b63ef82.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/sadibarefeku_novijex_zisulifizum_jagosob.pdfIn PDF document text
    • http://madewithsunshine.com/cdma_in_mobile_computingb7viq.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/sutewekorogigib.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/c4086482ffd92e.pdfIn PDF document text
    • https://zuwiliwiwira.weebly.com/uploads/1/3/1/0/131071082/1712631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senusekavopodu.rf.gd/habanera_violin_music_sheet.pdfIn PDF document text
    • http://mezanemuwagoso.rf.gd/38166198160.pdfIn PDF document text
    • http://mogopubu.epizy.com/7734424227.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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5352 bytes
SHA-256: 8fe1da22764e7d6db43216aa685ac5eb675ae0147abd3815af1c496265ff14d2
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 11336 bytes
SHA-256: d2b9f4b3d46ac3103a18355461d66ed3eb2453d4b0b8174d96ece2c3c5adbfb3

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