Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6caab3bfd9b1fe0…

MALICIOUS

PDF

88.0 KB Created: 2021-04-26 21:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5be5eee3f4443f82a5d1887ece6f35de SHA-1: d2aa7e21bc8fca346b1d0e464079a75d5c2cde50 SHA-256: a6caab3bfd9b1fe0652bd8d7d5c5585cd882f400caaf7e5e06c9b7d07914d24b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'simplifying fractions', which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+simplify+fractions+with+negative+numbers
    • http://winoorama.site/tugigoxesdc5r.pdf
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe40b373d9f6.pdf
    • http://drenajkrasnodar.ru/66296982250utj0e.pdf
    • https://texodixoxi.weebly.com/uploads/1/3/1/8/131857215/2251609.pdf
    • http://reabook.online/lijabajupuxefukabadiwo1dy17.pdf
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/5592006.pdf
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fddfa144917f.pdf
    • https://cdn-cms.f-static.net/uploads/4409623/normal_60554aee2f5f5.pdf
    • http://meetcabinets.xyz/30592513278h9nqp.pdf
    • https://cdn-cms.f-static.net/uploads/4404964/normal_6030d914a46b1.pdf
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdf
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/602813.pdf
    • http://stalekost.site/amiga_4000_rom_download98yqm.pdf
    • https://jafekubu.weebly.com/uploads/1/3/0/8/130814731/b18100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://simavanexija.rf.gd/69667140190.pdf
    • https://uploads.strikinglycdn.com/files/6fe05fa1-617e-45b3-8b0b-95559f1afd58/firavomiretukupaj.pdf
    • http://tumofif.rf.gd/zotepivaruzi.pdf
    • https://uploads.strikinglycdn.com/files/e318e81a-da2c-4279-9f70-7728a58cf865/sap2000_2d_frame_analysis_examples.pdf
    • http://gegetebipa.atwebpages.com/jekojopugam.pdf
    • http://gonojutumuza.epizy.com/narujiniviva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011905.bin
4ab9a49d38a54ae48b801d2ab206e0867458dcc809d8efbf55c704e2757ef2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 5784 bytes
font_01_sfnt_off00012ca8.bin
2d7851eba9b9949b73a745fe2efd6b1fae7e68f220582a66c1e95b742dad76bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 11112 bytes

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