Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cdd493db029071…

MALICIOUS

PDF

87.2 KB Created: 2020-11-09 17:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 65f88bf9919a98177c18af92ba1e6227 SHA-1: 91fa7383e248ab28d568ce9eb7cf430819ea703b SHA-256: a9cdd493db029071c964d6a2da80e4fb68333130f292d87dcf4b9efb85bd83c7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL 'https://traffking.ru/aws?keyword=ffxiv+primal+fear+quest' suggests a lure related to a game quest, likely to direct users to a phishing or malware site. The PDF also contains a large number of external links, many pointing to S3 buckets, which is characteristic of SEO spam or link farm abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?keyword=ffxiv+primal+fear+quest PDF link annotation
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/0c7c961960e5.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/4359473.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/jamokaroxoj/rujufejoreraregujevina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36897301-9d80-4163-a8df-212f03c17923/19675181829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358b3489-f3ac-405f-9178-cdbeaecb6f29/79142456029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cfac25-570c-47b1-b315-8d869c11cd9d/arcforma_haj_frfi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f81b4dc-3127-43aa-a7c6-2b43db6ee522/gotopovawavorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238cb4d7-2f39-42fc-824d-634bf9a02aaf/bedok.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/wadasudalijemorizon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7e008f-ef8a-4cce-a2d0-bd13a27b0142/suviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c55709-bca3-48f6-bbb3-bffd421f2c6d/14303297722.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/pedamelefowumuwevef.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/pdf_creator_sourceforge_francais.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 5256 bytes
SHA-256: cd1199c7f8cc556364520f0105d22d4fe4671111aef5e6482a01eba26b17e70f
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10528 bytes
SHA-256: 4a61dc2787565848dc291cbcc75f3173f6147f553b20bab03db9c55df12b7b98
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16200 bytes
SHA-256: 31b9ae61cef8439650509772a9e7c46b380c5f05ab44686bc7c566013f51ef71

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