Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa6361ddda49947…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 23:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54fa9a01592212c0d0f3bf8f52c11019 SHA-1: 212f0c1420cee77d09eb2a14610cecbff3ab95e0 SHA-256: 9aa6361ddda49947abe7481627b6d5cc50b806da3d3d7837c348a11fde6e295a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or SEO manipulation campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a likely attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=role+of+restaurant+operations+manager
    • https://cdn.sqhk.co/nupasoxure/ijecjjb/37495177180.pdf
    • https://cdn.sqhk.co/pidikuso/fVPji6G/zozelodoteletarepimu.pdf
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fcdc118a474c.pdf
    • https://cdn.sqhk.co/dofofigeniso/GibiawQ/final_fantasy_tactics_jobs_advance.pdf
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/09e7d.pdf
    • http://rapugazif.22web.org/tugimojibij.pdf
    • https://cdn-cms.f-static.net/uploads/4370089/normal_601ba89dabca4.pdf
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/8109270.pdf
    • https://cdn.sqhk.co/xafemepino/iicmjfI/dead_wallpapers_for_phones_funny.pdf
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdf
    • https://vanosejifewufe.weebly.com/uploads/1/3/0/8/130814052/df675.pdf
    • https://cdn.sqhk.co/lolajelor/1x4VcnV/didikemalezizubof.pdf
    • https://cdn-cms.f-static.net/uploads/4379614/normal_605717a54a6d1.pdf
    • https://cdn.sqhk.co/losokifape/5uieieo/kivimibavuvesiranok.pdf
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5fe1eee71492f.pdf
    • https://cdn-cms.f-static.net/uploads/4500453/normal_5fd195cd29f60.pdf
    • https://cdn.sqhk.co/sopiloroda/ZT10ltZ/35816808819.pdf
    • http://gelupulofevabek.medianewsonline.com/baixar_passei_direto_iphone.pdf
    • https://cdn.sqhk.co/nogawevorus/giQkiaZ/tolexena.pdf
    • https://cdn.sqhk.co/jekunesoru/A7jjGib/child_care_aware_washington_scholarships.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rukinozo.epizy.com/butuzew.pdf
    • http://novupomajanox.atwebpages.com/can_t_hurt_me.pdf
    • 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_off0000eb07.bin
51c2ccfff0a165490fdbef9f514a4ef6c471e610ce4f4f2f2a0aac8176dc26d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 5228 bytes
font_01_sfnt_off0000fcc9.bin
378eaf848d0ddd17fe9fe37b8789958be724677f6c933383fac5e37f41bae27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 11024 bytes

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