Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6d548b7c5476f9…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 06:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7568f5e1018c5daf7d09e592b1abaa40 SHA-1: 03aba6ce1d0462012e781a65edbededc9f7e67cd SHA-256: 3a6d548b7c5476f9d435815f2408e870ec4071e21a042a2e978ec1766bd46939
156 Risk Score

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 disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing attack designed to redirect users to malicious sites.

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://bologen.ru/123?utm_term=electrical+engineering+graduate+jobs+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419430/normal_60212d5415227.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/bzhj2cV/51899391597.pdfIn PDF document text
    • https://bowavimizise.weebly.com/uploads/1/3/1/0/131070713/2544464.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jjJhdfz/adobe_photoshop_camera_compatible_phones.pdfIn PDF document text
    • http://tixshopclub.fun/8968097643h6j35.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/2PlF0jc/8725101504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fd11e2cbef0f.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/kOdehjP/star_fox_adventure_gamecube.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gejhChe/gejiminezawefimelux.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwutiro/cZiiExU/fobademuwabuzozudawifi.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/dhfbjay/download_live_football_tv_euro_per_pc.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/wegitawiz_kapavuwibiledu_limesagipiro.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/fegijosumiked.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hbifh2c/rineborer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_600e304496896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408995/normal_5ff8f046d82e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5280 bytes
SHA-256: 3252df4162df5cc2fc592e5d30bdb19cf9fb1b0e09b19a41c623923fe7074905
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10276 bytes
SHA-256: 578c8ce3a06f77aad9466d44bb67db763e592b969ee9e89b4c2c39966a7a90b6

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