Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea23595afb0cfb2…

MALICIOUS

PDF

87.2 KB Created: 2021-04-30 07:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8588b868e1ea749d008e6aea6c1b00ce SHA-1: dc780edc471789b17633ac4fe6b5e3531dc2c31a SHA-256: 7ea23595afb0cfb24bf253b57ffeed746dd4c4c0cd74fe9ce1f24820813f492b
66 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 domains and are part of a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the link farm heuristic indicate a likely attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=secret+language+of+birthdays+april+22 PDF link annotation
    • http://igcopyrightclient.com/download_game_stick_war_3_mod_apk7flww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_60604f323d950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_60490951b53bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601ce19f3b01d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd79d5827f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fed40cba89bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6049cee64815c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_60022634034ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_604f2382a519a.pdfIn PDF document text
    • http://theharaka.online/zuwupoxacpico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6019939a985a0.pdfIn PDF document text
    • http://trendmobile.ru/what_is_the_difference_between_an_llc_and_a_subchapter_s_corporation0v7w3.pdfIn PDF document text
    • http://pasetbs.xyz/hampton_bay_remote_control_app8ru2b.pdfIn PDF document text
    • http://changely.club/23593586807s5osh.pdfIn PDF document text
    • http://detonic-italy.website/36178113325eoa55.pdfIn PDF document text
    • http://imedo.ru/23505811386xjahs.pdfIn PDF document text
    • http://tricitysikhs.com/best_pmp_exam_prep_book_2019q1c8v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5ff994638937d.pdfIn PDF document text
    • http://all-host.site/digagalikakomen9lg2p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5ffbc48103fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fc6bd8883ed4.pdfIn PDF document text
    • http://autokenn.com/91833144406coom3.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_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 5892 bytes
SHA-256: 77f646dcc2642d5b40165aaa802f2df36c6ceb708659f95b72f78e3eeb6f5a95
font_01_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 13016 bytes
SHA-256: b46878dd3f7420f6df9c7c1700ae0e87b06c7eae2640a29a120465554b05a9f2

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