Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb46d39811103a7…

MALICIOUS

PDF

92.1 KB Created: 2021-03-08 00:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d7c73325b5396f343d9ad33b54945ccc SHA-1: 882eab8d11860e6df025ec7d0c03f4aa194d3b52 SHA-256: 4fb46d39811103a70dba2edfadc3792f6179dee2bf17d30f1aef3b462d795501
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, indicating it functions as a link farm. One of the primary URLs extracted is 'https://seumenha.ru/wix?keyword=vocab+genius+answers+level+1', suggesting a potential lure related to educational content or search engine optimization. The presence of numerous PDF links on disposable hosting further supports the link farm hypothesis, likely intended to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=vocab+genius+answers+level+1 PDF link annotation
    • https://cdn.sqhk.co/reretukida/WAhfo8B/wuresogedapigufuxulip.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/giajgfd/first_strike_paintball_rounds.pdfIn PDF document text
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/kitufidiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_60034e02d09d4.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/dSkVMgg/gejolawefobitutuwegaf.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/2876573.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/kafimugakeka_mokizimojuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_603f01e0cb300.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/iiifEgf/zen_basketball_scoreboard_free_download.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/berekikesitetexusobe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_6002b1a04b4ff.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
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_1ac6e64f17d04bb29ed9e94ffac96d65.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_87f4eda487ba46c4a3d47b243c322334.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_e642e6c35700449ebe7acf7edc746756.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de972ff8-616b-446c-bab0-4d54f96c0bb0/74483163793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e147c625-3589-4023-a60b-735c02055d2d/how_to_enable_scan_to_computer_on_hp_officejet_4630.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_5b8ffd1dec9146538b36a59fde1caa6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2ad7f2-6df6-4ebe-8281-ae7958f833f6/lowumolinegiw.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_2c868969d4af47b782816c977c250c51.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_3644689ea0434d2b8e88f84eb7c9176a.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_1fc003464d464c948e40cd163edd0089.pdf?index=trueIn 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_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 5080 bytes
SHA-256: edca85b3f2a18b7dfcd3a5e49893303e9829575ebb3cb15c629ce218f671fb3b
font_01_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 10852 bytes
SHA-256: 2c5dc069c4d19f1dc0f0cd205ee5857b2394107f4a475ba7746dacc8fca544ff
font_02_sfnt_off0001552f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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