Malicious PDF — malware analysis report

Static analysis result for SHA-256 98801856f8e99276…

MALICIOUS

PDF

69.0 KB Created: 2021-02-28 12:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b7ada90d0216879dfa1f32bd091b8f1 SHA-1: 25e9f3ec853946a418bb0d0e9e0168b48a65ab3d SHA-256: 98801856f8e99276c02dce9e453215dde5785f8cfcd8a338899276e18085e012
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and the ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=enam%25C3%25B3rame+de+ti+se%25C3%25B1or+letra+y+acordes
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/defozaluxus.pdf
    • https://cdn.sqhk.co/puzadowoke/dsCrgXX/high_school_simulator_2017_download.pdf
    • https://cdn.sqhk.co/vilubofi/cifoJI3/nulus.pdf
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/bekug-gudejesenekoja.pdf
    • https://kovuvewu.weebly.com/uploads/1/3/2/6/132695697/zaruxigirir_bujuxik_zabapiwuwod.pdf
    • https://cdn.sqhk.co/dikapagoloza/9jeihjd/speedometer_definition_dictionary.pdf
    • https://cdn.sqhk.co/miviterul/kibhhgd/40021596487.pdf
    • https://cdn.sqhk.co/suwajipufo/uH3jiBo/60922902792.pdf
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/eb666ebf0a582.pdf
    • https://cdn.sqhk.co/lapefuxolu/cEejjgi/81221833757.pdf
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/f9b6628e630d40d.pdf
    • https://cdn.sqhk.co/pemenixa/3ZMjnjc/zominili.pdf
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/9000e7f870729.pdf
    • https://cdn.sqhk.co/mimufedu/dvUmGTg/homeschool_calendar_printable.pdf
    • https://cdn.sqhk.co/mugolino/ggbb903/7428362209.pdf
    • https://cdn.sqhk.co/kixagixupo/ISjjIgj/damebuliweb.pdf
    • https://cdn.sqhk.co/letijefa/3gwehhc/punokafexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotodur/13135811325.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_off0000cd79.bin
4f90fdb0ed91f287573063ef3fc22ff44100e0e7b697d1d8b322ec7696e6d3eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 5492 bytes
font_01_sfnt_off0000df98.bin
7ead8668405519d4bb16038fd692ae8e040badf86afef6d47ae450ac3d154290
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 11368 bytes