Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff486d9cb121007…

MALICIOUS

PDF

81.5 KB Created: 2021-05-08 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c750793d4f2e426525a8850054da3f SHA-1: 29309757303447ae01d70a818318701d62a14485 SHA-256: 9ff486d9cb121007460ae8c2ae03a8abbfd6c739fcf147243ed79bd7b88fd937
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, and a PDF_URI pointing to a suspicious domain. The ClamAV detection as Pdf.Phishing.Trojan suggests a malicious intent. The document body, though heavily obfuscated, appears to be a lure related to printer issues, likely designed to trick users into clicking the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=why+is+my+hp+6520+printer+not+printing+black
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6021902c7567f.pdf
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fcf2e1f08dec.pdf
    • https://cdn-cms.f-static.net/uploads/4460447/normal_60540f4d1581e.pdf
    • http://womovenum.sportsontheweb.net/32990820676.pdf
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/0e2a26.pdf
    • http://ripugusulufiluj.getenjoyment.net/90799427392.pdf
    • http://tiwilofojifig.sportsontheweb.net/tabawudixobosizajawiput.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5fd7f0d7a1940.pdf
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/vatolozejizilore.pdf
    • https://cdn-cms.f-static.net/uploads/4481061/normal_601f8fba67e4e.pdf
    • https://motapesuna.weebly.com/uploads/1/3/4/7/134749044/xakunavevulu.pdf
    • http://xiwakaravivomik.scienceontheweb.net/57524433390.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/817357.pdf
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/584174.pdf
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/7efcf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_935afbf280894ccc8b8e1df0860d6382.pdf?index=true
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_32099b37c3044def923cedaa80025e36.pdf?index=true
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_f702f43d9c53401a931d04efed98d411.pdf?index=true
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_ae0171b67b1644f888be8f58318deff7.pdf?index=true
    • http://rofuvawitarul.atwebpages.com/train_ticket_cancellation_charges_2020.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_47f64ee9fd274f579b33f7245f974179.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5da.bin
66da72d0a89ab99bea08ade934c9db867d7d83341008e7c6e3407707c838676c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 6220 bytes
font_01_sfnt_off0000faeb.bin
523e1ec603911cf97caf9b6abfe62bdaea1759d35851e550ad2ba732118432e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10204 bytes
font_02_sfnt_off00011ddb.bin
e498aa4bc7ff3381ef822d02ad632a1c5632555027214ada3f9c2245c00ebed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 17696 bytes

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