Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeff1a51ddbc320a…

MALICIOUS

PDF

71.4 KB Created: 2021-03-23 10:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 49b7b35693a38d3444eef3a8e0476aca SHA-1: e825ee24368323b3dc724307b1957f23f7533270 SHA-256: eeff1a51ddbc320a4bb0705b909c2f854c7d8088a613f165b2887080d7af180c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious activity. The document body is heavily obfuscated and unreadable, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=dell+inspiron+3646+desktop+price PDF link annotation
    • https://cdn.sqhk.co/sugezigo/Y941zBY/23818686637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff25a01712d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/aijijji/dojasiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_603e3a2f596d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_600a6c89dcddb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5fe3651c93b9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_601be2fe9b0bc.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/ayurvedic_upchar_in_gujarati.pdfIn PDF document text
    • http://terugate.mypressonline.com/navokimo.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/NgiXoJg/pusenag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_600b66aa8ee6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5ffe42a4e1e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_604de4e406286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5fc5bec2a5992.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/73652063527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6216181d-e267-47ed-a5da-b2110d88454a/9809073828.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/flannel_sheets_on_sale_near_me.pdfIn PDF document text
    • http://wiwazez.epizy.com/cancer_de_estomago_causas.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/algebra_1_teks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed59c4d-6d8a-4c82-8b4e-e9bcf921b915/why_wont_my_fax_machine_send_faxes.pdfIn PDF document text
    • http://pudosuvosav.atwebpages.com/94342696219.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 5328 bytes
SHA-256: 85f243669812c83fa22e8168fceedfb9c3af999ee6c818ffe5c719a0e25f0b19
font_01_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10752 bytes
SHA-256: db0efa4d115667865e7c716b355c17ccbb20512a35d6a6f310479fe3344a1c68

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