Malicious PDF — malware analysis report

Static analysis result for SHA-256 4968acf0a94d0b7d…

MALICIOUS

PDF

91.3 KB Created: 2021-03-31 07:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8f3effbcef2734c10e0ba25eae28700a SHA-1: 63baddc0cc0712cb384c8be9b713af988e1aa848 SHA-256: 4968acf0a94d0b7db50571c5caf22d9580b39e693e17691dae8b2b4f1b0caa54
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous external URIs that point to various websites, some of which are disposable or associated with malicious content. The primary purpose appears to be directing users to potentially harmful external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=colchester+sixth+form+college+jobs PDF link annotation
    • http://x-bionic.shop/39882774588ul5g2.pdfIn PDF document text
    • http://sqrab.top/bhojpuri_song_2019_dj_remix_video1fw6s.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/xisiludasupepid.pdfIn PDF document text
    • https://wozepunelom.weebly.com/uploads/1/3/5/9/135993859/munezonigovutimokile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_60549cc9d2d07.pdfIn PDF document text
    • https://kolabonedabisam.weebly.com/uploads/1/3/4/3/134398983/roniwoxap_tosageg_liwage.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hdaXFrt/pilot_mountain_middle_school_supply_list_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_601889d13a206.pdfIn PDF document text
    • http://itawomen.fun/fajigapokusaviwutedizz1z0.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/7a954a1e50c7b27.pdfIn PDF document text
    • http://artrosil.xyz/342724729763jip4.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/y6iajcU/skyline_gtr_iphone_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_95a80437b7324519b9c2d07e150d7dc1.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_2f81c59ee3ca44649f86f652d127ec28.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_5836bea8f3884580aaf54956294fb997.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/motor_vehicle_accident_report_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/mokogubusuzesiz.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_d0f0228c104f497a85bf911389502ba2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/ferrari_f40_engine_swap.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001254a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 5276 bytes
SHA-256: 04b699debd1ce8f9596ee4ecdb65a47f7b0c0d69db3d83447c03989cd27361a3
font_01_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 12192 bytes
SHA-256: 5dadcdb17a60adc77ff4e711fdbcc746bebe063266abc447517d27f308b5416b

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