Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f0dba8ca5afacf…

MALICIOUS

PDF

118.4 KB Created: 2021-02-07 12:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 86c9c0f437031a5678a112a54ef77de8 SHA-1: 3ab0aa54865f82daee4d8229682136eaf3c07d9e SHA-256: 93f0dba8ca5afacfc129acc9e472a0eca2ffe7fa1e5f1c8ccf53c2609005141a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various websites. The ML classifier and ClamAV heuristics strongly indicate malicious intent, with the PDF being detected as a phishing trojan. The presence of embedded URLs and the link farm structure suggest the document is designed to redirect users to potentially malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/wb?keyword=stoichiometry%20worksheet%20grade%2011 PDF link annotation
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/6517100.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/4071799.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/jeYRoqc/2998958005.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/wojajusawotez.pdfIn PDF document text
    • http://zixosoliga.iblogger.org/halberd_runescape_guide.pdfIn PDF document text
    • https://wubugijesagaro.weebly.com/uploads/1/3/1/4/131437106/nujopiwilet-fexidepokidibi.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/9783437.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/rixobugomisakadobuse.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/BghNUjj/72027083613.pdfIn PDF document text
    • http://rocketdocs.us/18394070191a8ewg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5ffe91f950145.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
    • https://s3.amazonaws.com/bopuxosavubare/conversion_of_measurement_worksheet.pdfIn PDF document text
    • http://jepevam.rf.gd/allahabad_high_court_aro_previous_paper.pdfIn PDF document text
    • http://kitasiru.epizy.com/wixuwap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 28352 bytes
SHA-256: 631b7245f45de29e24f82cd7b26f1d772e74b066c08eeac6ed3f4a1a06233798
font_01_sfnt_off00018337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18337 5416 bytes
SHA-256: a2530ef102d3172b8c9d390061cf18579cf657bf279a4585b0624e66002e40d0
font_02_sfnt_off000195ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195AB 11784 bytes
SHA-256: f0976d1a9853b5762760a04ad787945ed7842acceb157cf20eb369f37508cf24
font_03_sfnt_off0001bdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDD0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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