Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc51763555ab5a5…

MALICIOUS

PDF

83.0 KB Created: 2021-03-26 06:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2bb1b142f871d8832badf0ca706ed1 SHA-1: db33a88b15d2446e45557d943efa1a9a7aecfccc SHA-256: 8dc51763555ab5a5f16ffc69f26bdd73166c64f5ef20d8995d231a8e601f4d50
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically pointing to a large number of external PDF links. While no scripts were directly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=city+mini+baby+jogger+double+manual
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603195694f044.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://cdn-cms.f-static.net/uploads/4383930/normal_605a048d12ed0.pdf
    • http://ilook.market/gipemabxhcj9.pdf
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdf
    • http://gebigulexejo.sportsontheweb.net/belly_fat_burning_exercises.pdf
    • http://kopogaxepaku.sportsontheweb.net/47788840583.pdf
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/9de2264.pdf
    • https://cdn-cms.f-static.net/uploads/4384045/normal_600da19a8937d.pdf
    • http://shoppermarket.online/43029429489dxzjp.pdf
    • https://cdn-cms.f-static.net/uploads/4409118/normal_603462eff108c.pdf
    • https://cdn-cms.f-static.net/uploads/4387711/normal_605a6654eb642.pdf
    • https://cdn-cms.f-static.net/uploads/4371806/normal_603c4ff733b15.pdf
    • https://cdn-cms.f-static.net/uploads/4454054/normal_60467a06276b5.pdf
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/e293694a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/wefemabeni/28870465654.pdf
    • https://s3.amazonaws.com/sowewazulejewi/6563593920.pdf
    • https://s3.amazonaws.com/kelukakeb/multiple_meaning_words_worksheets_4th_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f124.bin
9e7fe941dbe5410dc910bcb2bd46e3adddadaf3082f930ba8c7471735407a61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5192 bytes
font_01_sfnt_off000102ba.bin
5884341d851957c291679abfb2438fa62bd48e7ded3f737bea59d78405c862d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 6816 bytes
font_02_sfnt_off0001188c.bin
08c25dfb7e0c2057f6a4b529eba5f93b2877d01dd00d0f41219e77cf6baa3fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 11296 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.