Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df6dfab2125f23c…

MALICIOUS

PDF

82.2 KB Created: 2021-05-25 09:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 008e0c8c1c05687c119d443f5cacbc85 SHA-1: 2b662a5a0539c324550350edce4d0584975e13cf SHA-256: 5df6dfab2125f23c7a989496ff25675f89f020ce44ebe903202c1d1664914829
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The embedded URL points to 'yafferge.ru', which is highly suspicious. While no scripts were extracted, the presence of a malicious link strongly suggests a phishing or malware delivery attempt, likely delivered via spearphishing.

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=how+to+apply+cabot+stain In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_600cf1dbc1ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_60660793e1e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_601295b75129e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fc956292ba9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fffdb5376573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_600cc9cd1fbc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446264/normal_5fe36f78e38c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_606ae9397e9fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_5fd6737f4b299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5ff8bee3e68e3.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/82093d09-49d8-441e-82c5-048201b98c15/what_are_good_alkaline_foods_to_eat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4094520c-08bf-4cbf-ae9e-832b0522e1b4/bimosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a28215-d9cd-4243-88d4-86fd0be1a0fe/asus_rt-n12_c1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37898e67-690d-44bc-8bee-92cf465560d9/xinisodegoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a078212e-1702-4586-938a-b92d95589ef5/filodumopedirojowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da14c395-34a9-4e3a-a999-37914cf39b58/foxososemowof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cf88c7-8c35-47c1-83e4-728d2f4e0b34/45743583786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cdb426-7256-4116-9963-967d299a60fd/39436129704.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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 5128 bytes
SHA-256: 645fe3b1d99e5b1645baf587373f89f75377602120dbabc7b49554dc76f0275d
font_01_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 10948 bytes
SHA-256: e58f8682b332f9077204ff533885a9fa08fba3f7d4b05c33b690a894918a788b

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