Malicious PDF — malware analysis report

Static analysis result for SHA-256 3953d505ca1124b2…

MALICIOUS

PDF

69.1 KB Created: 2020-12-11 22:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d31e07022fccdd7009fd27de89c19946 SHA-1: b931fdde546a579c3ac4193030c553efb073e06b SHA-256: 3953d505ca1124b26cef1298757993ed2c8ae902c5ea8e446f194c8849001158
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one points to a suspicious domain ('traffset.ru'). The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=orange+roughy+recipe+pan+seared PDF link annotation
    • https://nazaxefuv.weebly.com/uploads/1/3/4/5/134589683/togujut-kukez-vusinevonewo-dedesiwonuro.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/purufiz/ikariam_naval_battle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/assisi_convent_admission_form_2020-_21.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/molecular_shapes_lab_activity_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/19742789166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a52107-5c13-43ce-bce1-32e0601d6d9d/13647409603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f41f21a-a122-41ae-8ed9-ce35735257ea/gibobetedo.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/adrift_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/healthy_weight_loss_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c9e538-ac28-4136-889a-b617ba732ea5/fiber_optic_star_ceiling_shooting_star.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/25852891461.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/fluid_pressure_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/maferiditu.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_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 5432 bytes
SHA-256: defb47ef0435c9652adcedccbbce928fd46f6fc9d726398ed89195794f635fc7
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10924 bytes
SHA-256: c86878288d0f648787e0f7c39757a5f3547f83179fa4cb2e8403ad9f9c57fae5

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