Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf3f772313aa69c…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 19:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0abfcc28373ad936315e96e5b09dd62a SHA-1: b121404cdd3aaebec9679680f18223c313f00abb SHA-256: 5bf3f772313aa69c719b6ad6187493cc31ae859672b6b9d7b4ed76ebdff01489
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 0.9995

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://pelibifir.ru/award?keyword=blueprints+psychiatry+pdf PDF link annotation
    • https://nixitemolepof.weebly.com/uploads/1/3/4/8/134870129/ad5343b5.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/liforexatuwepev.pdfIn PDF document text
    • http://sparzha.club/domiwerofcn8l6.pdfIn PDF document text
    • http://rat-red.space/70790633014i6bp8.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/saluwopojon.pdfIn PDF document text
    • http://rivafigikiwax.medianewsonline.com/94978223096.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/ignou_assignment_cover_page_design.pdfIn PDF document text
    • https://jinezivatu.weebly.com/uploads/1/3/4/6/134687025/323840.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/1288318.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/23412586079y26zl.pdfIn PDF document text
    • http://floradoma.net/hp_laserjet_p1102_big_sur_driveryx35c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_322ad213a1484021b901d7a1201fae2b.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_743016043c414d03b9930fdd04d9c988.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_04f3a57c15e64bf8bb5dfe47713f3f74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/how_to_use_nikon_sb_910_speedlight.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/interior_design_colleges_in_texas.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_7bfb9af0bd6b42e190b1a8fe7cbf40e3.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_eaf32bc72d194388b52c37e0a7609b79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/33982936224.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_6e124a0ed7c246308cdc2cf1e56898be.pdf?index=trueIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_5932f76eda2f4007a60f82108a9f600c.pdf?index=trueIn PDF document text
    • http://pimobepetokonud.myartsonline.com/calligraphy_letters_download.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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 7548 bytes
SHA-256: 30701ee0f05dff9d7d52a94321278fa5ad0bcc2c8d59f69ae363ce018033c557
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5396 bytes
SHA-256: 245f95b1acf844ee521c5445cc13f5f4de9d1d5781d83a312ea14bad78fb760d
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 11096 bytes
SHA-256: 893fa766321304678d965941495317d4f97f42f16c37aad745d5c2bae4656a2f