Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c9179c6220eece…

MALICIOUS

PDF

83.1 KB Created: 2021-04-04 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6ff272abf5d1bd4c008560de4813b2d2 SHA-1: cf32fbdf2ec12462b355211d0261c766cdf1d9cb SHA-256: b3c9179c6220eece1e177ac3fda3329fe1642302a6d4f76a36e91fce2732fee0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=beechcraft+duchess+76+poh+pdf PDF link annotation
    • https://cdn.sqhk.co/zinazejoras/idLyjb4/guess_the_city_with_pics_answers.pdfIn PDF document text
    • https://tuzakipimuvujuv.weebly.com/uploads/1/3/0/8/130813756/7282d3ec333cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/binisomomup/gFjfjhE/75000713383.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hjhdBih/best_offline_gps_navigation_for_iphone.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/mipagulisami.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/9938097.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/mO7Lv4V/schofield_sims_mental_arithmetic_4_answers.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/alternative_fuels_free.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/sociological_research_topics.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/24974759132.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/lunabopenoxurikomiz.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
    • https://uploads.strikinglycdn.com/files/b19849dd-ad05-4a71-a8b9-d111266c51c4/89559281801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09be1eb-b099-4dc1-a80f-49b8e047eadf/95957295001.pdfIn PDF document text
    • https://d692b82a-d563-45ba-818c-0512d98079dc.filesusr.com/ugd/1c7397_2796bd907e044be0849cf2088c11a5b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26711c6-0b27-4ae8-b619-8916993d7375/bagujemafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8d0de6-8660-45b0-807b-80a88bbb5b70/sumadotekozeporenuxawero.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_ff69f7b71a31433fbcfafcf5c43aa884.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc6cc16-a50d-4cc1-a3dc-00d0c8a21401/rowoxidikafebutame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4719673-e7cc-4616-a9a6-6f5653d180f3/basic_logic_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46be81fb-e857-4518-aeee-d1099d179d03/how_much_does_it_cost_to_rent_a_portable_oxygen_concentrator.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_e723dd6737314a3a9de8338ce2189a5e.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_77578051cd49441d9e45f96c5c82f349.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83875a48-a2ce-4500-9652-422ed535d0bd/naneseneduva.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/harman_xxv_pellet_stove_distribution_blower_not_working.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_931acdb3e29a4a10a525ac5bd9e348de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5952b4f-78cc-4bb7-992e-6a3171c27261/sogenute.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_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 5220 bytes
SHA-256: 83e514d1b17a437358f2b39054d2ebd048025261db8588a4eff130b2e2680b8a
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 11144 bytes
SHA-256: adc14791ed7f19feb2cb3ec058737fa1d7cc3a2ec36eca1d41b34be4639e4bd6
font_02_sfnt_off0001302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c