Malicious PDF — malware analysis report

Static analysis result for SHA-256 290541b4f6563eb0…

MALICIOUS

PDF

82.2 KB Created: 2021-05-04 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 91e0eef0a4c5170cbc18d40ca0adefb4 SHA-1: 485cc6a3843491b166b906d855562991245bdbf5 SHA-256: 290541b4f6563eb06869aee2f5272b03f8cb315e568a8b060e627a77deac2150
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/strik?utm_term=dewalt+dws780+parts', which is likely a phishing lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=dewalt+dws780+parts In PDF document text
    • http://lastasked.com/didorewobenaxpwr83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_6025b9cad74d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_5fcda6e3a420b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_6068f26e127e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_601bf59031c27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fccb3659b5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_605eed6592a95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453730/normal_600992860f04a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fc9e97f56799.pdfIn PDF document text
    • http://tgesheff.xyz/4888525026474rza.pdfIn PDF document text
    • http://chisto-chisto52.ru/990990538321to9p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff62ee35230d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5ff3d2ab5ee27.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/fezenur/how_to_change_battery_in_vivint_alarm_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987f48a2-824e-4d70-b03b-df7d3920b0dc/phillies_schedule_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/99695081547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb83f65-f45c-4282-a01f-0fb2c337629e/best_books_for_fitness_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/adobe_photoshop_cc_2015_softonic.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_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 5460 bytes
SHA-256: 584d956423322bff29629a1149351ef11db0cc182272947b789d98f5170edb2d
font_01_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 10104 bytes
SHA-256: 15217e61deea43ee4f5d89d323fffe5f38015db93b31d4d8302940e1763b273f

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