Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1f5597bc97e87d…

MALICIOUS

PDF

66.2 KB Created: 2020-11-22 03:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 548f4df399fa8384891d92d071b6daa2 SHA-1: b32213e00c8f84f22aec3a604d46814a5ecfdb07 SHA-256: 7d1f5597bc97e87d1342bb1b3a2103f5076962794602b019ef7fff73eb9d9ba3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/123?utm_term=discrete+random+variables+exercises+and+solutions+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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://cctraff.ru/123?utm_term=discrete+random+variables+exercises+and+solutions+pdf In PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/jasonimogakor-salenarejomisaw.pdfIn PDF document text
    • https://xewaxamuroz.weebly.com/uploads/1/3/4/5/134529724/f78eb41310a3004.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/7857710.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/gitoveputawesos_vujotuk_gutafinitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_5f9232d60ed69.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/vefavukavukobe_lesogabeloj.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/6d65cdd2-8249-4ab2-b939-11ba8d6abeb8/gorodoxovevafunogakalogus.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/altivar_58_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/laboratory_training_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/dojosuwifexufasetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78aadb3e-fa2b-44fb-8942-1022377ea3f2/fs_13_trke_yama.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/83560299090.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/noxamopogadiniti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e941bc-3d67-41dc-af8e-c8b3e8dcd483/gezudeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd18fdcb-e781-4394-bff8-e620e4adf3aa/gogeludanegalesiri.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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 5568 bytes
SHA-256: 399de56e3646b4c6be9bdab5b5edb339e6ac64536af76874d21ae2ddf1c78141
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 11612 bytes
SHA-256: 9a54dbef75d372c164d97f288fa555e0543fbb5a7364fd97f4bd7d1124e68281

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