Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b430f2e3a2719ab…

MALICIOUS

PDF

61.5 KB Created: 2020-12-22 23:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4386141aae93ff280442dd8bc4801cc2 SHA-1: 17b351384321eb09688dd6419f43e2e7dc17823d SHA-256: 8b430f2e3a2719ab3f84fb1357df7605c303ee1a2ec96b1abfb3efbe289d6139
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to Weebly-hosted PDF files, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to 'Indy 500 pictures' and wkhtmltopdf, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=indy+500+pictures PDF link annotation
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/8427869.pdfIn PDF document text
    • https://lojijuzirikoza.weebly.com/uploads/1/3/4/5/134593465/ea7d9e713ac2a6.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/2075341.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/gepeta.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/zewabirulegepi-suwiwibujutuw-tedame.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/jamevizuz_puxanuxirikita_wodege_limolev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace6f785-f1ed-4bad-b677-60d53f430104/76719176852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac38d78f-d440-41bb-a765-467fd7bae2bc/the_humanure_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7babc1ab-0c03-48cd-854a-2ae39391c65a/worogizudomad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253940a0-0538-41d5-9765-3b48b81e9acb/wagageginugipizavuvok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba72aae6-dee4-4135-9ad1-1869d0d25e9b/wevitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186a59e7-3480-4ebf-90fe-a93d1cc1c9f9/nobobopepesafawovifefabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e6ba75-8a73-4772-aa00-5b0d8e51c1e5/vsc_off_lexus_es300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba180bb2-fbe0-4c40-aebe-cd6962a11740/67998243311.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_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 5132 bytes
SHA-256: b8da0dd92227ddbe45b73d1ca804b348bcdbc4beb04276119735cad71fd45877
font_01_sfnt_off0000c63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63D 11200 bytes
SHA-256: f59c5bc4f6c25c651e789868ac7241d8cd2909c6153b1e1a68fa4583595cbf15

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