Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd6b3f9b430b640…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 05:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d63951fad3e32ba86e5cb482b80f32 SHA-1: e1f2d09578f05b4eea4c1bcf18cade7c8b9a3936 SHA-256: 8bd6b3f9b430b64069f3e023da45929c79fc8e0c1b0144eaa4be40241a078530
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, https://jacksth.ru/wix?keyword=death+of+innocence+book+pdf, suggests a lure related to book searches. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=death+of+innocence+book+pdf
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/a5e9a.pdf
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/cb4c535f55.pdf
    • https://zakepanitug.weebly.com/uploads/1/3/5/9/135977879/b8d58.pdf
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/6945230.pdf
    • http://ripuxojelirul.iblogger.org/rasedowaj.pdf
    • http://enots.space/juvebod4t32k.pdf
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/39924e9.pdf
    • http://islandlandscapesbb.com/wedding_anniversary_cards_for_freek2vfp.pdf
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/wugixofumik.pdf
    • http://jixuboxa.iblogger.org/ruger_sr22_rifle_sights.pdf
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/81c7032820.pdf
    • http://yognat.space/bawuvekavivagimaxuxyjq.pdf
    • http://womumonafip.22web.org/relufimobudotogeduv.pdf
    • http://teleporttur.ru/fejabnq5qn.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/8291603.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fibalikirikoti.epizy.com/what_are_some_brands_of_brandy.pdf
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_56744712888a432ca08a2488d29384a5.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_26b2c0bb3b7a483f8a75dbd378b1f80a.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_f3478a13997847b4ae6b873981a1d379.pdf?index=true
    • http://katezoluvezile.epizy.com/53949004343.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_ffb2a425e2294b82bb9388e81d62d954.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_1b981fe6075f4528a5cfb1d1ec07d558.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5b.bin
9af611f22efe6014f04377b3a62f26e6b8f919b09882a3cbe2199ce17577d1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5140 bytes
font_01_sfnt_off000100dc.bin
bf962a52847868beffe731e13f09fae9a2f33f259e0480cda95d20fbc42b881d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 10044 bytes

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