Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedb44bcf45d605e…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 04:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e244ae579f08f78491004c77735d5c41 SHA-1: 9f8dc9d1caa1e10cf2af890957ceeb9dea239912 SHA-256: cedb44bcf45d605ef4de309c35c385db69a841fcb7d02d248e8edb010f55ca04
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of the ClamAV detection 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to common technical issues, likely intended to trick users into clicking the embedded malicious links.

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://seumenha.ru/123?utm_term=why+my+laptop+cannot+connect+to+wifi+5g PDF link annotation
    • http://ita-bio.fun/naturalistic_paradigms0ott.pdfIn PDF document text
    • https://finutobinito.weebly.com/uploads/1/3/1/4/131406284/niwilemat-lapomaw-xuwevo-toxipa.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/toxorodezodedu_nizuzavebesi_vowuzipaviw_vodugokuwediw.pdfIn PDF document text
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/e070570bcd131d9.pdfIn PDF document text
    • http://insta-sale.site/how_to_reset_a_whirlpool_fridgejo7zk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fec675d6b20a.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/rofexo.pdfIn PDF document text
    • https://bibikabefome.weebly.com/uploads/1/3/5/3/135392895/98f5bfdd.pdfIn PDF document text
    • http://itchia.space/materia_organica_conceptocm0st.pdfIn PDF document text
    • https://puvawenoma.weebly.com/uploads/1/3/3/9/133999826/2846252.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/8426438.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/f2d6b98.pdfIn PDF document text
    • http://tesocoin.online/snakes_on_a_plane_soundtrack_release_date64e0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffe6f55a4c86.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/2102080.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/5283326.pdfIn PDF document text
    • https://kevigedevuk.weebly.com/uploads/1/3/1/4/131438682/98f902ad.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_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 5484 bytes
SHA-256: 5cb84c951f360d1e1ec65cb58c8b1c7690631942c62a587f206c5cb7db787fdc
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10340 bytes
SHA-256: e4da614cd5003757fa3ad0194b0d0db608c2dce0500e0e2b1578d2698941f2b7

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