Malicious PDF — malware analysis report

Static analysis result for SHA-256 a358c45663f4ba18…

MALICIOUS

PDF

133.7 KB Created: 2021-03-16 03:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b69531005e16f6dec410d9c684e9f639 SHA-1: 7971000120e1f6c5406d181765ee5cb89d51f9d6 SHA-256: a358c45663f4ba18d61da837ec9845b8eb0a0819e96edc1cdedad426b1f41b60
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious or SEO-manipulated content. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of many disposable domains and Weebly subdomains suggests an attempt to obscure the true malicious intent.

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 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.
  • 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://soxebez.ru/strik?utm_term=define+hypersensitivity+in+autism PDF link annotation
    • http://jushq.club/lg_remote_not_working_ukwpheu.pdfIn PDF document text
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/79d6d2fe582b1e4.pdfIn PDF document text
    • http://gisisavodure.22web.org/29014678926.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/4302850.pdfIn PDF document text
    • http://avtoshkola-region26.ru/marine_corps_medal_chartfd8xu.pdfIn PDF document text
    • http://gadezobokonej.iblogger.org/simple_petty_cash_voucher_template.pdfIn PDF document text
    • https://sudomudes.weebly.com/uploads/1/3/0/8/130874284/vekekapovobi.pdfIn PDF document text
    • http://fabulouss.space/barbie_kristal_ato_izle_trke_fullhoyip.pdfIn PDF document text
    • https://geduletulaf.weebly.com/uploads/1/3/4/5/134509924/4565183.pdfIn PDF document text
    • https://binilitafi.weebly.com/uploads/1/3/5/2/135295912/gefadetaladebe.pdfIn PDF document text
    • https://luwomobesu.weebly.com/uploads/1/3/4/2/134235002/6607490.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/dulojuwizu-gedidoluzusa-vebitokov-bogegasuki.pdfIn PDF document text
    • http://notevidesi.22web.org/55980308659.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/2a384806732845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wometopususap.rf.gd/35158633932.pdfIn PDF document text
    • http://tobidenarero.rf.gd/lp_pneumonia_pada_dewasa.pdfIn PDF document text
    • http://mejesikiwabez.epizy.com/converter_decimal_para_binario_com_virgula.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/apeman_m4_user_manual.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_off0001ce44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE44 5268 bytes
SHA-256: cd502a916ff8e09173fd2edf5d06d463b1b905d13b6b6a66cf8979d5b08d297d
font_01_sfnt_off0001e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E01F 11632 bytes
SHA-256: b0c589363b6468ce95034a8bdaa54e9c46af9c9d438e191882b8306de2cf0711

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