Malicious PDF — malware analysis report

Static analysis result for SHA-256 369b354268c5b5bd…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 04:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 87234704a83096ac8225a9a2383cf645 SHA-1: 23422bc3a9aba3360aeb1d8de7794fb9064643c3 SHA-256: 369b354268c5b5bd965e94846699944ee09ce3f9ffedea8fa8e54e2424ec6bb7
226 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to external PDF files, likely as a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure suggest an attempt to bypass security controls by disguising malicious content within seemingly benign documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=ardex+cp+data+sheet PDF link annotation
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/81440e7c48.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/gfOIVRd/icing_on_the_cake_idiom_meaning_in_urdu.pdfIn PDF document text
    • https://jumirugefof.weebly.com/uploads/1/3/3/9/133997886/59c3bc2.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/6285148.pdfIn PDF document text
    • https://setijuxuzazoba.weebly.com/uploads/1/3/4/5/134500005/lavolavivi_punidabaj_wetivonul.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/xebofes.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/ehdjajg/pcb_terminal_block_3d_model.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/eUjjjjf/snapchat_story_saver_ios.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://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_a97c0d2a923f492baa97f36867a68442.pdf?index=trueIn PDF document text
    • http://zarenubopopo.epizy.com/jodamelibetebuwudotebo.pdfIn PDF document text
    • http://jupojef.rf.gd/1035481391.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/34789893794.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/spectra_s2_breast_pump_manual.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_0ca54edae5224c22846029dc6bdb2ecf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/47891518130.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_620dd01cc5984242ae7936e34f1e7320.pdf?index=trueIn PDF document text
    • http://nozasunagon.epizy.com/plane_simulator_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8333401c-2574-41d7-9bb7-ed8b099f3896/4247313956.pdfIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_5cce8d659c0a49d2a7b6f39a5f749917.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_e506793f953d4677b13d3b4c607cd5ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/63693742224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ece87f-3d0d-4e3e-87dd-827cd1c53fc8/20320843133.pdfIn PDF document text
    • http://fidolujure.rf.gd/zawodexebonegafupexopag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60615e7-9a47-4de8-be6a-86d4a1dacffc/taf_decoder_python.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 4708 bytes
SHA-256: 6a4d04e84b92c6fa0a5430ddbe9b664ebc2cdd878f0f6f4cc53dc05e515ee6c1
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 11036 bytes
SHA-256: 1856045e81d7d0e665488b025bd0efbbc612a528d67b9d428db59b9d3edcaf82
font_02_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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