Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1708368dd1d0025…

MALICIOUS

PDF

67.9 KB Created: 2021-02-15 16:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0c3f47fef8896f6649e6f09f39010845 SHA-1: e80ee80050b83cf450f15d0c3681898e7823a5fc SHA-256: b1708368dd1d00253e8a7bf1ebf7c33fd6158a5ee61689d1ab3cb8df18e3010e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, with one prominent URL being `https://baarspo.ru/strik?utm_term=kit+primeros+auxilios+coche`, suggesting a phishing lure related to a car first aid kit. The document body, though heavily corrupted, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the PDF is a wrapper for malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=kit+primeros+auxilios+coche PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ff617f1aa9eb.pdfIn PDF document text
    • http://legugoboxebepe.22web.org/pakubuwutirudulajupumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fe4407ae7c8f.pdfIn PDF document text
    • http://daating19.site/25431518200tr1ic.pdfIn PDF document text
    • http://e-sparks.ru/wapusubosuwoxufuzod0v839.pdfIn PDF document text
    • http://ourfanz.com/free_movies_for_mobile_phones_mp424zkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_6013c87e12e96.pdfIn PDF document text
    • http://igcopyrightclient.com/simple_proforma_invoice_template_xlseib0c.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/80404604045.pdfIn PDF document text
    • http://remont-pc.website/inaat_mhendislii_statik_ders_notlarip3qu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/32602339040.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/free_handwriting_worksheets_for_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/geology_rocks_and_minerals_worksheets.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_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 5208 bytes
SHA-256: afc647dd98437cc936ecb362ea6ba8a9eb38be49c7e42428cb5199ffa06bf472
font_01_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10684 bytes
SHA-256: aac02937454c5100c4f4a0ffa1c3820e3c689803711329ae23621728d4d3aa54

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