Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0edd0ab8ae60da…

MALICIOUS

PDF

79.2 KB Created: 2021-04-23 05:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63b37b4ed75c1fbe629333f107217842 SHA-1: 784e6cd213acac8c91b9824e72f699b6601130dd SHA-256: 3f0edd0ab8ae60da99efaa6990f63607c5db2e79e11ff0d784d4e7a69af66277
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate malicious intent. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/strik?utm_term=honda+civic+hybrid+repair+costs
    • https://cdn.sqhk.co/jaruxabal/rgigejb/carson_wentz_contract_per_year.pdf
    • https://cdn.sqhk.co/takoxuwal/ieRheYI/pacsun_gift_card_amazon.pdf
    • https://cdn.sqhk.co/pidodalatip/dLjgPgg/zumonubaponedadibenolejol.pdf
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5fd38a00633d3.pdf
    • https://cdn.sqhk.co/zupodejadofe/ibOgjgc/42389242714.pdf
    • https://cdn.sqhk.co/bepemuno/hagchgI/zarewepititatitudufezurod.pdf
    • https://cdn.sqhk.co/jevamivuvugi/jfuhhbj/ratosilav.pdf
    • https://cdn.sqhk.co/wafigefo/igchgha/wusab.pdf
    • https://cdn.sqhk.co/ketofebem/jahgAhb/transmission_fluid_pump_cost.pdf
    • https://cdn-cms.f-static.net/uploads/4483083/normal_605b9e2caa927.pdf
    • https://cdn-cms.f-static.net/uploads/4425533/normal_603b437bb7d8a.pdf
    • http://wegansit.space/lowerizajadutezie7pt.pdf
    • http://cardioactiveuficiale.site/pijosomo3bri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxunaf/23936120248.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_76d2d9b0d885423b81848ec590b4a966.pdf?index=true
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_296aea8301e84a5b9582abdb8971bd87.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_69da0da7c1fe46739f425db74802cb3a.pdf?index=true
    • https://s3.amazonaws.com/taguxif/happy_birthday_song_ringtone_free.pdf
    • https://s3.amazonaws.com/muwemivumazulax/33123374989.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_4f5a8cabc3544c169fff4d842c37fd6f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f749.bin
c5091840112121a56748bcb57e53d4ebd3423d0f5207aca6bb976eb1f74f2653		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 5392 bytes
font_01_sfnt_off00010999.bin
7b225e8940ead3bd26bf59d49316f8c4976e730809a9162b6072dfb6dcbaf5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 11088 bytes

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