Malicious PDF — malware analysis report

Static analysis result for SHA-256 9301d1992a129636…

MALICIOUS

PDF

65.8 KB Created: 2020-11-18 12:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ec82442506e26807b55bd11de1d12cb8 SHA-1: 9412521a6163378016066149130d56527c8bea0d SHA-256: 9301d1992a1296363eae40eeb744b5d29460cfb8a2d96aefc1be39b13e7f1fd3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure 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/strik?utm_term=exercices+subjonctif+imparfait+espagnol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5faee30861f90.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/wekudusoxakimujere.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/79e9db019e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fa5a035d3813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5f968e2b27e37.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/4643970e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fa89ed0f34ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8d377e3c0cf.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/pazifetanegapu/75168942913.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/finance_budget_highlights_2018_19.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/gm_map_sensor_seal_gasket.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/dexifofimubezili.pdfIn PDF document text
    • https://s3.amazonaws.com/sanekufiwumafo/westwood_elementary_school_west_de_pere.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/anderson_county_detention_facility_clinton_tn.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_off0000c0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 5576 bytes
SHA-256: 0ec291e51e6d161392be5dbca0c45d4078606ed7096190404e7677cb8747c7ea
font_01_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 11764 bytes
SHA-256: 9c5c8f3df09269c62c7dd6003a2e2f4a5f518b5c4f4b08266a6d2aad5e3bb40e

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