Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f073a93b309073c…

MALICIOUS

PDF

83.6 KB Created: 2021-01-23 10:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1da1e44b2e88c858d2c3adcfff6d64cd SHA-1: 209cf40187de9cff95efce53c7ede8925e402bfa SHA-256: 3f073a93b309073c37316dbfe6627875caea4cf6af7a2d37c4613d9014feb427
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://druttle.ru/aws?utm_term=mentor+request+email+template PDF link annotation
    • https://muzitotixigo.weebly.com/uploads/1/3/1/4/131407705/7342dca4c.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/oEOhfii/costume_ideas_for_couples_and_dog.pdfIn PDF document text
    • https://site-1178256.mozfiles.com/files/1178256/kumolojanu.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/hjhcQie/game_maker_language_reference.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/03bdc1069.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/hcihjeW/designfilt_bandpass_matlab.pdfIn PDF document text
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/3a6986.pdfIn PDF document text
    • https://jotafatebukuzeb.weebly.com/uploads/1/3/0/7/130776674/dunuxavixejakusemiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/nubowolimit/agheEvl/voxib.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/jomosoxufaz.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/5100993913.pdfIn PDF document text
    • https://site-1197512.mozfiles.com/files/1197512/accrued_expense_balance_sheet_or_income_statement.pdfIn PDF document text
    • https://semogabetik.weebly.com/uploads/1/3/1/4/131482882/ac0918a03f6.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/a7e422528622.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_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 5096 bytes
SHA-256: d80877d23063e4197d5befcb3b81b39bcd2abc36e315a8ae443522ca15a5b93b
font_01_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 10512 bytes
SHA-256: c3383f8d4eadc880b3911f1ce8ef3d9a6f3e6180ab76482969e70d0936728d4b

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