Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d8bc111549dd96…

MALICIOUS

PDF

80.1 KB Created: 2021-03-28 20:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1936d074b025cae45679b5ee18783b2b SHA-1: 7c28883756bb85114b22cad1e335e4ae9a46f6e0 SHA-256: f6d8bc111549dd963c212baa53f0ae4cba524295b3c75c1de977efdef14a16c6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to other PDF files, suggesting a tactic to distribute content or potentially malicious links. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to create a network of linked documents, likely for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/wix?keyword=soil+salinization+lab+answers PDF link annotation
    • https://cdn.sqhk.co/tesosunimew/kighigi/stickers_del_perrito_triste_para_whatsapp_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_601b120f9512f.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/Lifa1r7/furious_death_car_race.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5ff2e1b645981.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/LSGgcwV/diced_tomatoes_chili_style.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410190/normal_6000658838c04.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/bujut.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/843bbee62442e7.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/RlibhiT/xenidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_604ed369828e5.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/fSJEje5/passport_id_photo_maker_studio_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_6038b5b53914b.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/DBjgrha/jugojirufaridurowuresikef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5fcbc8093e8b5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/djiF0Co/tetesejot.pdfIn PDF document text
    • https://cdn.sqhk.co/fovomesit/gljbYsx/dilimolanirow.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/QG6ggxk/56425353675.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/mewoxurazeditu.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/jqijhgV/ww2_airplanes_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/y6jiuh3/27812665593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_60302ad2b9b3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 4852 bytes
SHA-256: b55040f571e3f0cef1eee214cc2843a98ff16cbc7b6d134d392228510adb8dd2
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 11124 bytes
SHA-256: 74a50bac5582e9d84918eecbcc791f886bc8c133ba0e26b582a8debeaffc6c3d
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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