Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b2b4e7c4ea8df8…

MALICIOUS

PDF

79.7 KB Created: 2021-03-15 13:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb32f5d7f26b02a528c7367dc001a317 SHA-1: 01b16cec42de98ad0bae6a0fa80f9d357b370be3 SHA-256: 71b2b4e7c4ea8df8941f3784be23905814b88a736d2c8bec2921c27f95fda305
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The primary malicious URL observed is https://leonvi.ru/wix?keyword=univox+superfuzz+clone, which is likely used to direct users to potentially harmful content or for SEO manipulation. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=univox+superfuzz+clone
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/tofuvoparijoxal.pdf
    • http://leadtop.co/7102247072075tdg.pdf
    • http://kukushka.space/117216397102pqyp.pdf
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/gopipufapibunesemu.pdf
    • https://winalefumigis.weebly.com/uploads/1/3/1/4/131437210/somago.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/pefasapefewubisefuvaj.pdf
    • http://jofufunobek.sportsontheweb.net/mavizilozuberax.pdf
    • http://xejepurefe.scienceontheweb.net/what_does_narrative_elements_mean.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ec4a7817-2971-459a-9576-27cddfbb3320/dometic_4_button_thermostat_reset.pdf
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_a2b632b367b543eeb9d31e5102306a9d.pdf?index=true
    • https://s3.amazonaws.com/fatisake/pulefij.pdf
    • https://s3.amazonaws.com/xapidajovaji/2013_bayliner_175_swim_platform.pdf
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_194c1ea1d9f24e4982d829238c16bcce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c71d145-670f-4bf8-9468-59d211fd8ea3/canon_mp250_ink_change.pdf
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_ee8d8bdd47d141cd8ae5992b75b2ce46.pdf?index=true
    • https://s3.amazonaws.com/rolefosiju/bhangra_paale_aaja_aaja_dj_song.pdf
    • https://uploads.strikinglycdn.com/files/4c4a84ef-e1ab-4a01-bf76-d149dde93dc7/wopatixoze.pdf
    • https://s3.amazonaws.com/dotivaf/davenant_foundation_school_ofsted_report.pdf
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_163751f8a25040ca90d3feb4c400f1dc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab478427-33ab-468f-ac34-9b32c44a6aef/68761066310.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5f.bin
8420b38579254276d9eb3544be655d04f68ff0070f66f9754e6e17854ec4fab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 4968 bytes
font_01_sfnt_off00010c78.bin
0d12483c648304f930ca8a97e232bcdc505a5c1e5c636905f0620b4d46a1e78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 10784 bytes

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