Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1edd6a0b70633a…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 02:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b26dbab845bd1d8b74377e75aaa3c8f0 SHA-1: ea5242bc37f3f7e352cab5b783b29fe20a2f81e1 SHA-256: ec1edd6a0b70633a44388e870b3e7e7fdb22d5a06f309df45ce26e18d03eb269
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains a large number of external URIs, many hosted on disposable domains or link-sharing services, suggesting an attempt to redirect users to potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate structure for distributing links.

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://botokaw.ru/aws?utm_term=what+is+arts+integration PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/fLjbmii/17391009393.pdfIn PDF document text
    • http://latencfsrt.space/juwokovarokixudmuhtc.pdfIn PDF document text
    • https://wazefiwef.weebly.com/uploads/1/3/4/3/134369298/jelivazalivup.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/gifhg87/tiberius_fs_first_strike_t15_pdw.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/b09d6a4bcda.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/hficnBI/orange_tree_buy_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/j9oUJhj/nuzanadasobi.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/3veHgMC/sefum.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/fFAijaO/75711743641.pdfIn PDF document text
    • http://com-signto6.xyz/selective_digestive_decontamination_guidelineseqjgm.pdfIn PDF document text
    • http://usblighter24.site/machiavelli_the_discourses1mlq7.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/jhigirp/botolujarugunamorosariwu.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/8263167.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xalelafo.rf.gd/kasewolad.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/dominican_republic_deaths_toxicology_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/90629104592.pdfIn PDF document text
    • http://tofarogupa.rf.gd/print_ambir_calibration_sheet.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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 4928 bytes
SHA-256: d1f8e91115d4c8b764584ecb76b671aa0c7ff3a6c8c022941289736250e2bbde
font_01_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 10948 bytes
SHA-256: 0d793116558d1078eeb6e7b146be6b6874721aaba93cd151c6145ef7a4e2aac2

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