Malicious PDF — malware analysis report

Static analysis result for SHA-256 163ca8009e6a8c9e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 15:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3eb62c2ef92b93080fa643a6ac1ecafb SHA-1: 1a151d7191e21bdccf31848012ddc1010baf80e6 SHA-256: 163ca8009e6a8c9eed2a9139f766eedf5ad45997386ab520201d9a5e5687bc83
126 Risk Score

Malware Insights

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

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 0.9990

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=frostbite+graphic+novel+pdf PDF link annotation
    • https://cdn.sqhk.co/dasewugiru/NVfjjN9/gestion_de_la_pme_debouche.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_6048235224195.pdfIn PDF document text
    • http://moscow-siberian-force.online/transition_words_middle_schooltz8fo.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/rzmhihe/exercise_defender_2020_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_6057bad2e2f65.pdfIn PDF document text
    • http://ruszaimclub.ru/1795461213qhk97.pdfIn PDF document text
    • http://levantemosaic.com/maze_runner_freera76v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_6021d8a2ab4f8.pdfIn PDF document text
    • http://spoonnumberone.xyz/dorimevefaxqkadw.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/78759806063nkzzl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ff239dc3f48c.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/igWifha/vegew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458634/normal_60076ae2df25f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_33d95b6afb594a3eaff568bb7ae316c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef73652b-0050-4585-9926-e6ec8c01bd18/lagirelijajuzegasezuzifaz.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_5f26735f8f3841478804aad78785a264.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_b27a461c4d3546de9518995bd79f9a03.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_0bed1b108c004fba84ac102b7dda9c4a.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_b9ca6cae1fe249cf8a33aa23e8b88223.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_9d765a1cbe264b14b266e85a4c468da3.pdf?index=trueIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_ef149b88f5524e5ca22b1f5682211f5b.pdf?index=trueIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_dc9f682a63ff46c9a36dedb4ea30c38a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d52e8c4-983d-4b36-b754-25fe59c1ad37/vapelup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7c3127-4f59-4bbe-ac97-8c1e96b0842f/who_has_ethanol_free_gas_in_my_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a84cc06-b9a8-4e1a-8cdd-1d61a2c6606c/the_great_gatsby_vocabulary_quizlet_chapter_1.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5572 bytes
SHA-256: 0bbdd4d5426e5a1f72251c6ef681c9e9fca4ca03a3d19eac84d75d2f26acbe45
font_01_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10704 bytes
SHA-256: eaf62b4ce88f4cbdce833af2a44a5529e32db04f8b6502f9766254370edec39e