Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df7dcb280ea18b…

MALICIOUS

PDF

68.7 KB Created: 2020-12-18 08:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 48abeedc632a695dba4a199eff856a69 SHA-1: c8a94149d13fa73f2dcb050a22bb3e72429805d7 SHA-256: 92df7dcb280ea18b654d56b7944c69b0c0e91b0a356d780f7e6b8bfdb8a3fec9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to a malicious site, likely as a phishing or malware delivery mechanism.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=elf+on+the+shelf+goodbye+letter+2018 In PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/3650843.pdfIn PDF document text
    • https://vajoribenokajug.weebly.com/uploads/1/3/4/7/134713142/d77c63b4708b30b.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/mituvexavotise-bibine-fojikoxogu.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/570834.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/7798707.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/vudobakogefevuneku.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/77b82e835ffe.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/nowokil/xekudogurinebadej.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/ethos_pathos_and_logos_definition_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14179bd2-559e-44b6-afe2-e9441247a1bc/59596988200.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/diary_of_a_wimpy_kid_casting.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/kokoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b6f00a-47e0-412a-8fc2-598b022f0129/leader_strike_unblocked_games_76.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/brinkmann_q_beam_led_rechargeable_spotlight_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/polynomial_long_division_with_remainders_worksheet.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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 5676 bytes
SHA-256: c925308b416a463ea542aa36c9825d049933b2418f471d9f70e5488a2c2dd470
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10068 bytes
SHA-256: 9be7b1c0ed7d98fb49b1297c9ef1360aecbf59a10905444640f8c8c04ad0ec01

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