Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b0d305fd8f6a0e…

MALICIOUS

PDF

79.9 KB Created: 2021-04-05 15:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db45f1afbc959f1a263cc7751c9b098f SHA-1: 27ed2ae2105609b24b9c3816127e58b8aae04dea SHA-256: 85b0d305fd8f6a0ebe81685600ef74f2f00d484ea3300678a44a4938c98936fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://lozipotod.ru/aws?utm_term=linksys+ea6400+ac1600+review, is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/aws?utm_term=linksys+ea6400+ac1600+review
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/2202302.pdf
    • https://cdn.sqhk.co/vusutazomaga/Uhd9haB/27600044194.pdf
    • https://cdn.sqhk.co/kitujesijak/MMUfjco/small_business_plan_sample_ppt.pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/xibexa_pavileretagu_sakonosuxiwibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_d86c4bf5efbf42b6907cc76e559dea73.pdf?index=true
    • http://xuxinoniruxisu.rf.gd/nowizukore.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_9d1d75363778474c84192f73b128f2d3.pdf?index=true
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_7b77ffb3e802486296c1158ecfb48048.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e86f7df0-0ccf-4240-9af0-c92bb7edd16b/why_is_my_paint_spray_gun_spitting.pdf
    • https://uploads.strikinglycdn.com/files/0de3d121-b67e-4d7e-aa83-6e6dfd5d1980/51827938479.pdf
    • https://uploads.strikinglycdn.com/files/5795424e-be45-4763-896f-53685802d60b/jepoliravewowul.pdf
    • http://kubenusuwixop.rf.gd/57219611850.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_934a9091f11d4221b0ef823b0b005d84.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_5d4092079c5841eeb82efc9ab5b363c2.pdf?index=true
    • http://saruwuf.epizy.com/vatiwunetiranaxir.pdf
    • https://uploads.strikinglycdn.com/files/822f395e-e060-4c7b-97e7-84165be076d4/pagubi.pdf
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_d710b7ab09d84b05bed70407e10c379a.pdf?index=true
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_10e33785e6c140198255b67fc7375e53.pdf?index=true
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_42bed721d5ce4b629b7efc10e0b3115d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d3.bin
6bfaf4b1b9c97513d20afc22c53aa61e56a3e4c8d4d5dd5f72fe810330e15741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5456 bytes
font_01_sfnt_off00010b9d.bin
74c53d8c0fc29deace9e048f3fa39f77b625b67faab59fe74a3aeb69fced1168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 11544 bytes

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