Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a9ed7f41ff986…

MALICIOUS

PDF

107.3 KB Created: 2021-01-13 16:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 82433f0685f78ea5cb8c926cd654b00b SHA-1: 8bec21d32aab00bfb35c3cd2dcd4fc6e15b20131 SHA-256: b15a9ed7f41ff98631a0a8363a7f245c6b513fb3c8866610aff7b43d97408967
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'largest information technology company in australia' and 'wkhtmltopdf', suggesting a lure to potentially malicious websites. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users to other sites, likely for 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://traffset.ru/aws?utm_term=largest+information+technology+company+in+australia PDF link annotation
    • https://site-1177258.mozfiles.com/files/1177258/13304472377.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hcNhitt/sufuva.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/9964409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feb1b1cc2a99.pdfIn PDF document text
    • https://site-1173271.mozfiles.com/files/1173271/lobobodobojixojivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fdf7fabb5ab3.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/UrayHqL/fall_guys_game_download_uptodown.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/7663679.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fcc8d52924f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8740cc85118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/jekogitesewidefimawiti.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/buvames.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/written_in_my_own_hearts_blood_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/common_integrals_cheat_sheet.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_off000163b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B0 5472 bytes
SHA-256: e05c97b5ff2a995d01969f02787d4f047dd53eb937436f481c6ac8e670849084
font_01_sfnt_off00017635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17635 12704 bytes
SHA-256: d58e540368b9f48055b7b844a8402a27eb0e0df911170eca47ac8c612a9dbe45

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