Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcefb675a66b97ec…

MALICIOUS

PDF

87.4 KB Created: 2021-04-07 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1b17db5dc1e02cf634b10c9ac2d8442 SHA-1: c1d3156917b954a8cd7ab99597211b9442acb21e SHA-256: fcefb675a66b97ec4e207fc3da107353a00e772b35cabb7c0faa2ea79d573b83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9949

Heuristics 5

  • 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 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://zajinet.ru/123?utm_term=tabela+cations+e+anions+completa+pdf PDF link annotation
    • http://nyvelsets.online/como_resetar_o_celular_samsung_j2efwc8.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/1734-ep24dc_installation_manual.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/9037301.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/b7143267aa.pdfIn PDF document text
    • https://visorupa.weebly.com/uploads/1/3/5/3/135305290/4572198.pdfIn PDF document text
    • http://numulul.mygamesonline.org/final_fantasy_7_guide_shinra_building.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/a5921544.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/acoustic_guitar_licks_tabs.pdfIn PDF document text
    • http://snail-case.store/how_to_use_schwinn_airdynetw0yo.pdfIn PDF document text
    • https://litisenos.weebly.com/uploads/1/3/1/0/131071047/743d6e0091cc9.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/what_is_the_last_sears_catalog_worth.pdfIn PDF document text
    • http://copyright-helps-team.com/2006_scion_tc_automatic_transmission_problemskxk3d.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/11638652197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d264ac6-f652-4e1f-93f7-2661712542b4/fowekomemilolofetewudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e1af4d-bb71-4c30-aebe-9671eb8b6a49/90334338273.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_461f0ac4d7524e3f886fde6950690c41.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_b3c7c0d39bd64618b9718a2da31ced6d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/540ddb56-7de8-47fd-bd0e-845a737f1b3d/17467828730.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_dd9a918e35894721a06047f7ae190433.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_7a046678e6604a1d96e35b98ac794f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a407f6d-d61d-4028-9d7b-71a71451fe22/93483657783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659fcd53-be87-4f42-9eaf-d05dc69a953e/autocad_3d_tutorial_for_civil.pdfIn PDF document text
    • http://sumoxajavagal.rf.gd/20013852366.pdfIn PDF document text
    • http://xonolori.atwebpages.com/32095754776.pdfIn PDF document text
    • http://wozurowimure.epizy.com/child_poem_video_free_english.pdfIn PDF document text
    • http://filutapokupa.epizy.com/kebulem.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 1896 bytes
SHA-256: 7709137971f39f5abd1f3f6c31984dba2f1561fa7cfa5648eb3dfe56ddf456d6
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 5292 bytes
SHA-256: 89f2d3a7ee89c1e37710f3a1ab4424e04a0ee87f583bdfb4c18769da805f8763
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 14540 bytes
SHA-256: f4794566abd049f2fdcdb482dd6fde969c38638b2bfbebb7a3eca7e36ce4b025