Malicious PDF — malware analysis report

Static analysis result for SHA-256 da475525eac5c15d…

MALICIOUS

PDF

71.5 KB Created: 2021-02-11 20:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0516402a50066a500a0e97ca4bce21b7 SHA-1: 26be27968808cdcfc9135bbf43cfaf93959cbb5d SHA-256: da475525eac5c15d20580b706a4181d94a882966bdb45cd6085871cae2f72e96
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/wb?keyword=sheet%20pan%20potatoes%20au%20gratin PDF link annotation
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/mojutexof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_5fcb4835d57c1.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/7508607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_600b6aa0b0aa2.pdfIn PDF document text
    • http://cloudmarket.website/lutopulujojesixurekotufum1py6.pdfIn PDF document text
    • https://wozexofinudere.weebly.com/uploads/1/3/5/9/135984457/gijijovo.pdfIn PDF document text
    • http://zajegipu.22web.org/gapotifuridaj.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/8145694.pdfIn PDF document text
    • http://juluzenaluziwo.22web.org/bovakubulavawub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roniwixanedif.epizy.com/sick_atm60.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/saxegogaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/niwibopodaripopugaxup.pdfIn PDF document text
    • http://nutujetis.rf.gd/tiny_archers_mod_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/48321787837.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/amsco_apush_chapter_27_multiple_choice_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/xotebepofasubok.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/poponivozixinubifegeketi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 5152 bytes
SHA-256: b587aaa005c6dc1abf94dc8bb58a112fd091fdbfe5afc4c9889b35b98537ae75
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 10356 bytes
SHA-256: 7ae2049d399a98a4732725493a6b8b538bfaea569888c3c771de4f62fa6aff16

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