Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8a9d15b4585393…

MALICIOUS

PDF

109.9 KB Created: 2020-12-24 18:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0f07de3f97a6046367cb298623ec81e8 SHA-1: 7bf2782c7de9e96b787d597d3f5483ffa45730ed SHA-256: 2d8a9d15b4585393d2d6dd317b0c5a59693b8351f3cff937bf063ce02a28f165
164 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 SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the embedded URIs, 'https://traffset.ru/strik?utm_term=university+of+montana+tuition+per+semester', is flagged as suspicious. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further suggests a lure to trick users into clicking these links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=university+of+montana+tuition+per+semester PDF link annotation
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/kodinukiwekijobafis.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/009f6df5f7df7.pdfIn PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/6020199.pdfIn PDF document text
    • https://katexiru.weebly.com/uploads/1/3/4/5/134576370/52e03a76bf87d.pdfIn PDF document text
    • https://xexiwimelogodit.weebly.com/uploads/1/3/4/5/134593193/8766765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fb95f22a8b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fa9397f68def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fc381c4df64a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tejuvonixag/cardiovascular_physiology_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/globo_reporter_portugal_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/orion_smoker_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/usmc_hmmwv_technical_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/microscope_parts_review_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16200 5048 bytes
SHA-256: 272dddc281f41d4a5bd5a3fa6f74b7b8c3f7393a0b21509f67677f799f18fcd1
font_01_sfnt_off0001731c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1731C 12004 bytes
SHA-256: a40c398b5a4f73aa6eedc1c352d330981bf93a1d99751cc02f3b5924a6655ae7
font_02_sfnt_off00019c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C0D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.