Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85caabdaf52196b…

MALICIOUS

PDF

77.1 KB Created: 2021-02-20 03:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55b7aeb7f332d0c8d5ac98399288b650 SHA-1: 7653df25d0fc27e71f1c653406717e9f6db996ca SHA-256: f85caabdaf52196b822a09bf185cde0e9e9ec66f52323da4a70c994eadf773a3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://yafferge.ru/123?utm_term=starbucks+almond+milk+cappuccino+calories`. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier and ClamAV also flagged the file as malicious, supporting this assessment. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=starbucks+almond+milk+cappuccino+calories In PDF document text
    • http://hookup153.site/lofumosufureposozuxadu1n9v8.pdfIn PDF document text
    • http://motivawka.online/autodesk_inventor_tutorialsnuvc5.pdfIn PDF document text
    • http://firstdoctor.xyz/network_study_guide_free_downloadk7m3a.pdfIn PDF document text
    • http://budozezofezuje.iblogger.org/90551277149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601edcd0b7c9a.pdfIn PDF document text
    • http://herss.space/power_wood_carving_tools_harbor_freightqaq10.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/hfgdIgf/zejosugovisirezumiw.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/lorerexeg/delore.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/92708869141.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/zekosole.pdfIn PDF document text
    • http://metuvubom.rf.gd/21507558302.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/gujuzozo.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/paxekurezibi.pdfIn PDF document text
    • http://rujavesejijoram.epizy.com/nonikigigibomuveboramipo.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5528 bytes
SHA-256: 201ac8ac3f60a9c3d4b8031d925d99870423074c921fde7f5a17df35205297a0
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11400 bytes
SHA-256: 7e23c88a9561becaf8d21333508e433172f164af4bf608587f22031224f8840e

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