Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44a5b43d2d562d1…

MALICIOUS

PDF

77.7 KB Created: 2021-06-06 00:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f8b266b9bfe09d6ff6bc7b397d4789a3 SHA-1: 522fe5cfdb58090f40cb1aa27c977dfb05e42659 SHA-256: d44a5b43d2d562d18a5f9c58f04e7e810e7605d2f9b9095aaae837dc76500c8d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://botokaw.ru/123?utm_term=cabaniss+psychodynamic+psychotherapy+pdf PDF link annotation
    • https://mifavawuzizadax.weebly.com/uploads/1/3/5/9/135977912/ec777a4d9b.pdfIn PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/genejomi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454966/normal_5fe59340987c9.pdfIn PDF document text
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/1731604.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/vifakoga_pariragujif_lovewukagibiv_gebadimerem.pdfIn PDF document text
    • https://madoxeviwijiri.weebly.com/uploads/1/3/4/4/134475969/ff5efad223db09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_6010e8e6d9316.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/semesomuwusexurewig.pdfIn PDF document text
    • https://rexuxoxef.weebly.com/uploads/1/3/4/0/134018301/dutobamimatur.pdfIn PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/bamiwiligogam.pdfIn PDF document text
    • https://xalidowugeduvek.weebly.com/uploads/1/3/7/5/137514787/1155329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493541/normal_602720c2774e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4424f3a4-3b9c-41fa-9acd-d2f6019787b0/miditewovuf.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/what_are_the_different_meanings_of_the_heart_emojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4008d30f-aa3c-44a5-87d9-6a9de2e01ff1/santa_clara_pueblo_v._martinez_case_brief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3416a39-e9ea-4e0c-bc76-fa012e53a903/62523321262.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/hazard_identification_and_risk_assessment_template_for_hospitals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd89d76-0f85-4fe9-909e-bd7bce32beab/fitamuladip.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144523197/80132321756.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/w/file/fetch/144686988/tera_rk9_guide_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd18673-6864-4b10-9dea-8b2f5efb3dc5/74752583862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/820b1c6f-952d-4c7c-9c2a-ec506e5d6732/75234769981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489eea4c-49a1-4685-a69d-cb3a4dfccc4d/directv_genie_mini_wiring_diagram.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144686397/how_do_you_install_fortnite_on_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6d28d3-3c6c-4daf-abc9-df7739b2df91/spiritual_bookshop_london.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a07ea8-5721-4933-833f-1f43e50aef4d/warhammer_fantasy_rpg_4th_edition_core_rulebook.pdfIn 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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 5512 bytes
SHA-256: 8d2197df1fdb57d9581cd114f07193383786dc36c85dffcf0bc210fd6f26fde9
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 10540 bytes
SHA-256: e13af6ef1167dcc7989db88ebfb4e87a7bfbe3960026c96717487c1348b5fd4b