Malicious PDF — malware analysis report

Static analysis result for SHA-256 0640ba18af29f961…

MALICIOUS

PDF

73.0 KB Created: 2021-03-18 21:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 99eecbbfa69de423532935f13bd7108b SHA-1: 5677e589e1dfbffb0f7d41987b691f570630f946 SHA-256: 0640ba18af29f96123b57f948d4efbc2bd659dcc8bcbe6cb6bb64ec779f7a7fe
146 Risk Score

Malware Insights

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

The file is a PDF that contains a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE, indicating it is designed to redirect users to external sites, potentially for phishing or scam purposes. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL https://zajinet.ru/strik?utm_term=htc+m8+battery+calibration is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/strik?utm_term=htc+m8+battery+calibration PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fe57f8479ab2.pdfIn PDF document text
    • http://simamopi.22web.org/can_u_get_disney_plus_on_lg_smart_tv.pdfIn PDF document text
    • http://fivogudog.iblogger.org/college_panda_sat_math.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_60183b404e083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_602558d2643a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_603998bb36824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fca15ebd3551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6033d34e22d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fe97c5d003b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_60363736d2856.pdfIn PDF document text
    • http://dolevukijera.iblogger.org/vangile_apocryphe_de_thomas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe1661aa068a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_60020e5ee258f.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/2b38be3f-2abc-48a8-bba9-0a17801198c1/calories_in_arbys_chicken_salad_sandwich.pdfIn PDF document text
    • http://dazozelagur.epizy.com/29438230971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2f0bc1-b8c9-4050-b8c9-224a7ff04140/13970785736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b0a7a7-8753-4c7b-ab90-3769372fe34d/walmart_black_friday_2020_ad_11_14.pdfIn PDF document text
    • http://gilotekovipani.rf.gd/helter_skelter_an_american_myth.pdfIn PDF document text
    • http://livajurusurex.epizy.com/guided_tour_real_alcazar_seville.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5164 bytes
SHA-256: e295ec703254d2a85235705e11af92b29dfe572f32db54d917804e574d9025af
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10992 bytes
SHA-256: c96b74b2daa293e595bb96f80ebe0b7886351211684685409d882ff75f107304

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