Malicious PDF — malware analysis report

Static analysis result for SHA-256 58399a1b240540c9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 08:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3ba0fcfe91cfd8cd67771641bc30dc5 SHA-1: b60557c0da9323531afbbcaede2cac77b74533e9 SHA-256: 58399a1b240540c956cfa8725a28fe05bb584819fe50f12f7f1ac0c9686555fb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=peak+jump+starter+750+charger PDF link annotation
    • https://cdn.sqhk.co/xovatagemi/r6ptjhe/29303513016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_6037143db1641.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/sagozas.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/pediatric_advanced_life_support_manual.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/marathi_alphabets_writing_practice_worksheets.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/primus_iq_brake_controller_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_600e46fde740f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_6005827345591.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ff2600b2a900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5fe06029d148a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuwaw.atwebpages.com/maternal_nutrition_and_fetal_development.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_ceb644ba5e654d9aac6729cc47d8a232.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9b4992-23b5-446a-b577-1f5f8122b19f/25959407945.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_2accd5ca1ba742af85267c2a2d51dc43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17db43bc-8616-4291-8414-247955be113c/55337976245.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_eb067751f6e54a31a16775b90d5f7b3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20fabf9a-6a6b-4d60-94ac-22094f223bdc/gener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34b6623-9fce-460c-bf65-3d8ab22e1fdf/96810549048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b5cb4d-901a-49cf-a2e0-66a4723d75e6/old_school_rap_lyrics_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031ba0c9-3c70-44c6-a4f0-fac39db7ecf5/mojeborawomig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10cb9a28-de59-47d9-ad14-08cdf35bd513/vozuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e80e4b-ca7e-46bc-ac18-ee4a5fee4db9/what_does_grey_color_arrow_mean_on_snapchat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951de360-bd78-47bf-b24e-367171acefd8/wordpress_tutorial_videos_for_beginners.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_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 5800 bytes
SHA-256: 5faf38d55f90cb272c8ce203474815cf0df66cd715685b87cfd932670ca58012
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10828 bytes
SHA-256: bc08aa8edaf11c1a6eba223797bc75576409b09e71f05543ca2e3353b18957d2