Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f40152d35c4d610…

MALICIOUS

PDF

135.9 KB Created: 2021-03-01 10:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9a120f51d543b10d6d2ff1e71927889a SHA-1: 7f295c657ed7ec3d6acc7df59b150de53bf113b7 SHA-256: 0f40152d35c4d610b90209389408a35515316e807798f1b9f81bc02cf8d25bec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://zajinet.ru/award?keyword=html+tags+definition+list', indicates a lure related to HTML tags, likely to attract organic traffic for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/award?keyword=html+tags+definition+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446015/normal_6021956ce1ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_600f2f3589755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_60341a2d69c2b.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/1797246.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/7432851.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/6263781.pdfIn PDF document text
    • https://weneboremuneje.weebly.com/uploads/1/3/5/3/135317625/xeregowotov-kotisufefoz.pdfIn PDF document text
    • http://mmeueue.space/asme_code_for_piping880vr.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/jutusedezalimu.pdfIn PDF document text
    • http://vinnipoh.fun/fiwijutvcif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379961/normal_60098afddf40e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufafiwosekugon.rf.gd/cloudy_with_achance_of_meatballs_2_berry_scene.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A0 2872 bytes
SHA-256: a84fe8ccebaadaec26c68754ff56ec47e75d3d52b13675d8f9989f8d4dc65369
font_01_sfnt_off0001bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDDA 5092 bytes
SHA-256: 4802df498cbc5e48d9307b296c5ed540a3f8b45f5d2251ae0638ba54c16c4d4b
font_02_sfnt_off0001ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED8 6460 bytes
SHA-256: e53669f23e8431e49ef982c3515df70ec05f623ef46737d483c6fca0c1c9cd21
font_03_sfnt_off0001dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA3 16416 bytes
SHA-256: 91999337ddb3ff37d19fa9d3448241e7578a7a0033216b388badcdff7d66d3fd

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