Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f5af0a207609e8…

MALICIOUS

PDF

69.1 KB Created: 2021-04-07 13:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4e6f9c50ffac20c702781893540292d1 SHA-1: ee3b5ea412f557feed09a94fd5379b1215e37ba8 SHA-256: 63f5af0a207609e8b62f15dc830f2b480b05b64e9880a16a257eef22a7710a2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" by heuristics, suggesting a malicious intent to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/award?keyword=autoradiography+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446772/normal_602a583bbc10a.pdfIn PDF document text
    • https://cdn.sqhk.co/ponibokilil/BJjiUAT/computer_service_bill_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_60561bad59467.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/78268301181sw446.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/ifDiggg/nakaxasan.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jhbcuhM/pamupamefu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5febe8e7ac577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd7b794ecd80.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/9jjVZ8G/chi_square_symbol_in_word_2007.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/42579655403jmmtc.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/hhoiiKM/identity_v_x_danganronpa_part_2.pdfIn PDF document text
    • http://baltika-trans.ru/among_us_mod_menu_apk_download_mediaf_redi4kx.pdfIn PDF document text
    • http://onlinekartiadesi.com/how_to_reprogram_sportdog_collardcyx0.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/bipovoromoj/jijenuzigigolo.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/famasunisetiboditu.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/play_store_jio_phone_mein.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_9c81f31f2fb04da794e700cc6e6a6bb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savifin/seropalokemaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/42054160079.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_fa5c756c5846462e9fee3f2aa1e23fe9.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_c006e25d47db4666b9c7ce4464fa6085.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/48205324298.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_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 5388 bytes
SHA-256: ade509fc0f9ca8e15ec999ede584b5ccac4d615ad30f4eba149834893eb95656
font_01_sfnt_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 10348 bytes
SHA-256: 00792e006716cad32fa02ab9ba5e65f467a689bc77d56bb0fac3c86c4a7ee208

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