Malicious PDF — malware analysis report

Static analysis result for SHA-256 e241cfb59f281509…

MALICIOUS

PDF

78.4 KB Created: 2021-02-11 17:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 02aa060a19ecea319d863047b9d0b27e SHA-1: ea6ea0ae73f361e4421afc5591b17e36bcdc7cc8 SHA-256: e241cfb59f281509650802f84c54d8b85ecfbc22d55ce65161b24935f52bbdae
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or distributing malicious content. While no scripts were explicitly extracted, the presence of many external URIs and the ML classifier's high confidence score point towards a malicious document designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/123?utm_term=three+economic+questions+lesson+plan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384295/normal_600a497f6c5e8.pdfIn PDF document text
    • http://xtina.online/udp_tracker._thepornvilla._com_6969_announce2jq1q.pdfIn PDF document text
    • http://luminar2-download.xyz/system_sensor_p2r9b1w6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fe2c9274ee0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6012321fb6c88.pdfIn PDF document text
    • http://winoraama.site/211245621292aj6v.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/O5hc3je/2441991776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fea40760de57.pdfIn PDF document text
    • http://ag-management.space/red_and_blue_make_purple_song86bef.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/lurekeb068s8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5fe984701b15f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ffa957ec44a8.pdfIn PDF document text
    • http://jushq.club/google_translate_apk_for_jio_phonepmuag.pdfIn PDF document text
    • http://bit7.top/fugepujupaxitiloxerinex5nn9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3dcb77130d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_602272756a22c.pdfIn PDF document text
    • http://toppiksnack.xyz/18418506693smsk0.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/jeLhd8E/60568750041.pdfIn PDF document text
    • http://sks-expertiza.ru/dragon_warrior_2_cave_to_rhone_mapf8xub.pdfIn PDF document text
    • http://tvoyoproc.fun/google_android_device_manager_app26n4t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 5248 bytes
SHA-256: 5ff105bb4943853c02e527600537259bb8213afb5495055401e6a09e0ee3896a
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 11604 bytes
SHA-256: bb9439a732de3927e1171fb3efd11008d6535cc3216b742c82be2dd0a7dee7f2

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