Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b202d77601fd0d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-27 17:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04e5dbaea3da7dd0f41ac531175f3bec SHA-1: 4ea558adf7ce84f3e4ee285184dd7eb63144b169 SHA-256: 21b202d77601fd0d770c9556884b89124c77fbed8f350cc0f897d3422da1ec59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this behavior. The ML classifier also flagged the PDF as malicious with high confidence. The document body is largely unreadable, but the presence of numerous links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://soxebez.ru/123?utm_term=hwy+40+traffic+report PDF link annotation
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/malakawekugemi-joriguwi.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hjivmhg/c64._emu_1._5._45_apk.pdfIn PDF document text
    • http://look-hotel.com/dual_enrollment_georgia_requirementsmolax.pdfIn PDF document text
    • https://cdn.sqhk.co/bokupajokim/geTriab/posubarogiwekofakole.pdfIn PDF document text
    • http://varistop.site/29753740090jth04.pdfIn PDF document text
    • http://azorocheat6.xyz/risariwilezawiririsezorugrb8qf.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/a9jerhi/kilupowenaponew.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/aD6iehh/poguk.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/8640753.pdfIn PDF document text
    • https://fifitedogij.weebly.com/uploads/1/3/4/7/134747960/gejexude_gutibiv_befinu.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/ficNheB/zulumoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_60075190b34b6.pdfIn PDF document text
    • https://dalokagamamis.weebly.com/uploads/1/3/4/6/134695183/9374787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_60276062cce05.pdfIn PDF document text
    • http://legalvictory.group/winegard_travler_troubleshooting4as6x.pdfIn PDF document text
    • http://esclub.info/99066052765of6l5.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/69bf816d3ffde.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/jVjiKhh/77921855824.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hdAGXja/likepizabukijabemaresiba.pdfIn PDF document text
    • https://cdn.sqhk.co/nizidevogaka/bpgMkhe/fovopik.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/60776211499hgyut.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/7adgcxI/crossfire_volleyball_club_liberty_sc.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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 4868 bytes
SHA-256: 92b49b5944823fc8cff441ab0f1750253c7694ae53977c11c84a721f9c2be85f
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 11128 bytes
SHA-256: a0c43d9a60f1f6198ffd6e4a7e6ec5c55f469327e36640c8018d6124f79d4d8d
font_02_sfnt_off000111b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71