Malicious PDF — malware analysis report

Static analysis result for SHA-256 8454b6ba4e7e54de…

MALICIOUS

PDF

72.9 KB Created: 2021-01-26 04:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 591669c4dca89dafa1f647bd8244bb81 SHA-1: 0ee05521d1d25390f642cf1d4053ceff01c285de SHA-256: 8454b6ba4e7e54de11113107cdd68e41c3eaec7f78601222cbc673da6001e30c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, with one specifically noted as an external URI leading to 'traffnew.ru'. The PDF structure and the presence of external links suggest it's designed to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=tic+tac+toe+code+in+cpp PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/jhgfjcv/drive_safe_and_save_reviews_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/EPhahgK/mountain_house_freeze_dried_food_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/xvgKXhd/santorini_grill_berryville_virginia.pdfIn PDF document text
    • http://vinnipoh.space/49267948083jhkjz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5fc95c1710951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutulig.epizy.com/comprehension_worksheets_1st_grade.pdfIn PDF document text
    • http://nimozan.epizy.com/49376851665.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/avidemux_2._5._4_mac.pdfIn PDF document text
    • http://jeragapa.epizy.com/50752951871.pdfIn PDF document text
    • http://zigubogujivo.epizy.com/worebuxanejok.pdfIn PDF document text
    • http://bidusopevix.epizy.com/acronis_true_image_2018_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/59746014349.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 4712 bytes
SHA-256: 142414c9dd79afbafa85f9dc9c29efbdf2c51f664149cbb72c6e62b5fa2430ea
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 12160 bytes
SHA-256: cd8e6749c5260ed577a78265ef1c3a0418f1cfb70933c113dbd8f55efc4f7a9d

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