Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ea87688d3b248…

MALICIOUS

PDF

97.3 KB Created: 2021-03-28 18:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9675535d9a47360021157bdafe6760dd SHA-1: b489d35e5b42a425bc23c4318dcba14377afa0bd SHA-256: c93ea87688d3b24819209709fae4ca5ae251cb8b5dd6052d392bdb1ea2fe5b6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nipisod.ru/aws?utm_term=samsung+s4+mini+phone+review
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/tujukuxalajarija.pdf
    • https://nazorokofewedu.weebly.com/uploads/1/3/2/7/132710677/mukudawezofedila.pdf
    • https://pigegiwoxare.weebly.com/uploads/1/3/5/3/135385020/toresed.pdf
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/zomenanawidezes-gumixizatorurun.pdf
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/3864649.pdf
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/pupupefe.pdf
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/2725722.pdf
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/rodozag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a97cc435-ef8e-4ffb-8544-4b9c0bda5a6e.filesusr.com/ugd/7ab440_10f5cf8061694afba8c40cb14e500f3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94d15e89-d395-4b84-b225-dc45013e9fd0/93798485571.pdf
    • https://uploads.strikinglycdn.com/files/8071bc6b-c72b-401c-a0a0-9389d4e7911e/gre_prep_classes_near_me.pdf
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_8d8b1e5f183c44c49da404a6f974ac1a.pdf?index=true
    • https://s3.amazonaws.com/midipes/gawisakuniwiw.pdf
    • https://s3.amazonaws.com/wixatax/69805694084.pdf
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_cace9d5221c94757844917ca80b5f7ed.pdf?index=true
    • https://s3.amazonaws.com/suxuzubojut/fowipixodutanusiworewoxi.pdf
    • https://uploads.strikinglycdn.com/files/cf206b9f-4e84-488a-8901-817dd53f739b/the_crown_season_4_episode_10_review.pdf
    • https://s3.amazonaws.com/padosumifubobo/michel_de_montaigne_essais_english.pdf
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_0cf30e12b3f64d8db39dcfbb727d2170.pdf?index=true
    • https://s3.amazonaws.com/fivebo/82245406627.pdf
    • https://s3.amazonaws.com/mikibetiv/34208589887.pdf
    • https://uploads.strikinglycdn.com/files/9f0daa39-4730-4c6d-91db-53d46e75a084/convertir_milmetros_a_pulgadas_en_autocad.pdf
    • https://s3.amazonaws.com/wanasuvedigo/44604693913.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_5cb2a7b0a55e405cac3d54fa3f708d1d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001194b.bin
adb3f16d2dca43c0f82e76adb486338eb574fa8e0e3623a0422d8b03bfdc704a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 5348 bytes
font_01_sfnt_off00012b51.bin
9732e9fd265abc7af823ee50cf7b180f784f8b25d4e31166fbbb0e61d1b7aaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 11508 bytes
font_02_sfnt_off0001527d.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1527D 16092 bytes
font_03_sfnt_off00016744.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 4324 bytes

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