Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b252f4330f0620…

MALICIOUS

PDF

73.5 KB Created: 2021-02-15 14:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 03aaaab3683d8ca3e8cc11c2ff70adad SHA-1: a7bedeec221e20095bfa101b71024e71523fcc69 SHA-256: 41b252f4330f06204b62b402ac41ef91c6fc43f0b180138c1216a4b96ab3a257
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=how+do+i+scan+from+brother+printer+to+computer PDF link annotation
    • https://cdn.sqhk.co/tamoravuwera/SjajbSO/50948411027.pdfIn PDF document text
    • http://fridgeservice.ru/73387236124aehdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_6010020a49c22.pdfIn PDF document text
    • http://hopecommunitynaz.com/95171177167bhzn7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5ffa2d9811baa.pdfIn PDF document text
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/984731.pdfIn PDF document text
    • http://afracheat1.xyz/prokaryote_coloring_worksheeteo6gb.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/ihhIhft/95969769311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379489/normal_5ff22ff1a2d88.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/ae765da48.pdfIn PDF document text
    • http://online-sistem.site/76511225760l151g.pdfIn PDF document text
    • http://beststudent.fun/voltage_divider_bias97gb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482619/normal_5fe57295226b6.pdfIn PDF document text
    • http://mon-cmbretagne.com/3d_concrete_printing_pricevueiu.pdfIn PDF document text
    • http://banquepopulaire-fr.org/samurai_sword_tattoo_meaningjbk6m.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/6901914.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/xuwitufabupar_mujekojafosa.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/iihdgfi/58392830029.pdfIn PDF document text
    • http://topvideo.design/407814992951155m.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/7383305299030ox5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 5440 bytes
SHA-256: a0e47532510b4aeed5734cf4c4bc5790dddd1374dbd4a745b769a3012aaad275
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10296 bytes
SHA-256: 0fe061cd108d7ec60aaa9b202ff5c88763369d562587ee61c608d9164188dfaa
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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