Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f51c42d1c44a6c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 11:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9238135d62cfbf6c2b7b86e7b2b3310c SHA-1: 86ea59fe9c3d73c329b7c97c54c1969142b14dc4 SHA-256: b0f51c42d1c44a6c5be14c75162ea9c7827dd367d3eeea06ac8cbf94ce0f593a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dugedepap.ru/strik?utm_term=delta+table+saw+parts+ebay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467027/normal_603fecd14fd04.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/HjjBic3/color_dulp_crazy_circle_shooter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380871/normal_5fee34ba344b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5ff0a295c22c2.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/hjVlyHy/lily_s_garden_game.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/ifYigp3/85083763900.pdfIn PDF document text
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/gedegupa.pdfIn PDF document text
    • https://cdn.sqhk.co/votexeruwiti/jhiiiij/zazubolovubome.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/fTcgcpv/remove_curse_of_binding_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/dAmznhd/fun_bowling_team_names.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_603edef8050d9.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/3515195.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/rewewali.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/i8uoqjh/strike_fighters_attack_pro.pdfIn PDF document text
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/duvekafemu-muzumelufite-robazagiziwibik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_601e6402ee1f3.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/zozutirebepu-sexuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hfnij2N/sazowomenulalimepomujaze.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/jdGjibd/zubabedug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/53313031876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7442cebf-6807-482b-9f4a-b8377429238b/flir_one_pro_ios_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/manuale_cronotermostato_bticino_l4449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e38aa33-b50a-46a7-b31c-5df518bb2940/99205104093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1173f5-9836-4aa9-bf9e-e2b826d295a1/sat_subject_test_math_2_curve.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/454036264.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/what_is_gods_spirit_animal.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5148 bytes
SHA-256: 4168f6806f95f8656a1d6bd4c220bb238953bbb632c322536b4208149d306fc5
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 11120 bytes
SHA-256: 466684a95b4ffcad9d2d6500bc5048f1b01184cb178539e88dd1799332117a4a