Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f8995a9d95fc91…

MALICIOUS

PDF

74.3 KB Created: 2021-03-19 06:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e00a3a28a6be90a7d0f306b0f4f98f7b SHA-1: 33ae30c255ff001aee1df2a3ee9bd96a8b2b86f7 SHA-256: 98f8995a9d95fc911628b51af21b62170b55703e7f377d38a944648058b9e68f
126 Risk Score

Malware Insights

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

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 0.9989

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://nipisod.ru/wix?keyword=modeling+linear+equations+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413468/normal_5ff41db3e3b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_602addbbdb6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602097f4369ab.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/dusulaw.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/wind_in_the_willows_movie_1995_online_free.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/vertical_axis_wind_turbine_advantages_and_disadvantages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5fe3b4854a0bb.pdfIn PDF document text
    • https://zulanamojo.weebly.com/uploads/1/3/1/0/131071117/13efbf7359ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_602d754893530.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/will_amox_clav_875_mg_treat_tooth_infection.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_601a55fbd3666.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/humane_labs_deliver_emp_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_5fda7b57c7c6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5fcc99cb137c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60339c5527ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_605125f05213e.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/13213014619.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/4212803.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://rukodulaban.epizy.com/what_is_the_symbol_for_receptacle.pdfIn PDF document text
    • http://kasisexa.rf.gd/55682735818.pdfIn PDF document text
    • http://matogojetize.rf.gd/22564795822.pdfIn PDF document text
    • http://puredaw.rf.gd/kafiwoparexumokazotes.pdfIn PDF document text
    • http://babijegogaluz.epizy.com/antidiabetic_activity_of_medicinal_plants.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/types_of_anaerobic_exercise.pdfIn PDF document text
    • http://gabinosemepof.epizy.com/lamozigoresuzojobituvum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 5256 bytes
SHA-256: b062ee4b0e4c69fb7fa77382653fecf4d428ee81242000d5429d59d9b8c9ee82
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10340 bytes
SHA-256: a93052dce4b7e41e8b5618630fe2c15f39d9cc4b6b040def90744f77d17b6a48
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3