Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3b61f30b883bfb…

MALICIOUS

PDF

79.0 KB Created: 2021-01-10 18:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8e94ba5e9a57e9e334cdfa8cd8ac65d SHA-1: 7cd3ac145f5a3ecddeb9d2fc0a6402f650a1f1fe SHA-256: fd3b61f30b883bfb4f713fc0eb3f816bb2d30ba9342e3783a3327e6893e73699
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of numerous PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=4x4+off+road+games+free PDF link annotation
    • https://cdn.sqhk.co/sebixodof/geiijaV/vuporasijizefumefosewoga.pdfIn PDF document text
    • https://site-1177329.mozfiles.com/files/1177329/extreme_street_football_tournament_soccer_leagues.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/942503.pdfIn PDF document text
    • https://site-1178817.mozfiles.com/files/1178817/89636242358.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/gelewipev_duraxo_galofuva_wagojado.pdfIn PDF document text
    • https://site-1176254.mozfiles.com/files/1176254/61946779834.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/38d8b0.pdfIn PDF document text
    • https://site-1201825.mozfiles.com/files/1201825/mobile_top_soccer_2020_football_dream_league.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/jodikixavadojirefijuk.pdfIn PDF document text
    • https://mexugagerow.weebly.com/uploads/1/3/4/4/134482965/patuf.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/falojogore.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/ZiaicMJ/download_clash_of_clans_setup.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/mevulemuturekaganas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 4808 bytes
SHA-256: c3a39e9b7d50810d860c403e1afced3b7ff91b6ce8ea4555e966fa03ced5b1f4
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 11040 bytes
SHA-256: 2edca348101a3caa989324626a00d0bf0ea29d071052e7d66426040c25925744
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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