Malicious PDF — malware analysis report

Static analysis result for SHA-256 7221c7529fb17e30…

MALICIOUS

PDF

66.3 KB Created: 2020-12-16 18:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ab991169a6c8350ae24f0748a3c6354f SHA-1: df3ff9ecebd5171647ae7aaaf745dc9f14ce337e SHA-256: 7221c7529fb17e302f5361fe0ca094bc46c1bf477c34a95b3ef045bd034209b2
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the heuristic firings suggest a spearphishing attachment attack vector.

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
  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=word+print+envelopes+from+excel In PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/6078374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5fbd8e994834f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5fc6f125616c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fbc762c8cfd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fd603099a483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5fd6117ba1855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5f995a592a6ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f91819a37a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fb6ec791216b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_5fa4c1aab8d3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5fd31256d918b.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/e91f2cef-1a00-4f2b-8f65-00fa63afcac9/german_augmented_sixth_chord_solfege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608f4724-6249-49c8-a528-f37b7924731a/13674414341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/693fe54b-51a9-40a1-9d01-45a2b5e29d17/45655948912.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_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 5232 bytes
SHA-256: 69ba0e1dc6a18164e1dadf78c1aa429376943bad2d2e25a57b0c0ce0bae21760
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10068 bytes
SHA-256: ae9329daa0caddb07ae35efa1796d1332dd1a13b87a4cd00d1a6a43cdd79fc6c

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