Malicious PDF — malware analysis report

Static analysis result for SHA-256 810fc6308a6ee634…

MALICIOUS

PDF

69.1 KB Created: 2021-03-25 06:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e0651feff5ed15eff9274f851afbb7b SHA-1: 10c56226a68c4e223b4a8c8cad7411e56e9fe6e3 SHA-256: 810fc6308a6ee634284f5cd0766e7b96bba279fa6b7508e9f3af9aa1b6753ced
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 0.9992

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://leonvi.ru/strik?utm_term=introduction+to+data+science+in+python+reddit PDF link annotation
    • https://cdn.sqhk.co/gamakokub/jhjigiB/tiger_tank_for_sale_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/bhi6Cks/genuwogakanafuwazusaxex.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/98DV93v/12357017406.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/cjeMsgc/luwerovuwufi.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/a495a66b0.pdfIn PDF document text
    • http://kilubome.iblogger.org/fibetemowimanezav.pdfIn PDF document text
    • https://cdn.sqhk.co/kebisozakola/eCRHria/pusuko.pdfIn PDF document text
    • https://natuvowefuzun.weebly.com/uploads/1/3/4/5/134516005/9cf06bf.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/ijgcl95/bazigar_o_bazigar_remix_song.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/jghcTAv/covenant_keeping_god_by_chioma_jesus.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/injboca/99460708706.pdfIn PDF document text
    • https://guvixiwek.weebly.com/uploads/1/3/5/9/135976323/d48c0930.pdfIn PDF document text
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/bowupogojowusobakawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_eb74dda4426d4f71ae16941a9e6986e0.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_e6b1edb603c14141967dc4a2bd4bc16e.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b1a7b88f97624a308fc7979cde61b71b.pdf?index=trueIn PDF document text
    • http://fadirekobesi.rf.gd/employee_evaluation_templates_word.pdfIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_5d8c0dc193124b48b529d0f403c05c8e.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_0c29e70d2eba459595f343b7067713c1.pdf?index=trueIn PDF document text
    • http://luzeparuzibez.rf.gd/auriculotherapy_manual_free.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_15f435a96694453897ed5b9ea4cf4057.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_0da86f15b41e4fd49cb6801aeab9e400.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_44cdf3f9826c4450892093caf2d65c2c.pdf?index=trueIn 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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 5168 bytes
SHA-256: 85192499ac194e77639c50930472b1ebfafe5b915eb1a30a0059bf48def45d88
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 9984 bytes
SHA-256: 315af64e568f2ee5dc1db2f95eb32e7e2fc6b45f0d155975d2fad30d1b663d2b