Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1475971b54c9793…

MALICIOUS

PDF

67.4 KB Created: 2021-03-14 16:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f1219a69b0fb99c6ea81852ea678ab77 SHA-1: d84ea647f9297e0b0f4fd080e2b362a12efab836 SHA-256: b1475971b54c9793ad234029b54e708a23667d774c44611ed69b0772402ddf44
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or link farms, indicating a likely SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially involving embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jacksth.ru/wix?keyword=gundam+g+self+perfect+pack+hg PDF link annotation
    • https://cdn.sqhk.co/toxodimina/nn6CYog/badaram.pdfIn PDF document text
    • https://bokepamukabina.weebly.com/uploads/1/3/5/2/135293240/6651714.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/puwesefewosuf-kajom.pdfIn PDF document text
    • http://naturka.space/sorokanori02is.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_601b359b8e0db.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/jchghcJ/prop_hunt_games_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fca24514f915.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/jiTmFOv/numerubipenesurezuxil.pdfIn PDF document text
    • https://rovupugefo.weebly.com/uploads/1/3/4/3/134359584/wulot-munonal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_6047b1f670098.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/4gelijf/xbox_beta_app_pc_not_downloading.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/kovabamakakufaf_bunegexilufab_sujuzomo.pdfIn PDF document text
    • https://zebilukirun.weebly.com/uploads/1/3/5/3/135306511/pivoduma.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/81524f98bd0.pdfIn PDF document text
    • http://smirno.life/topevujeteradf2zs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_60239df23920e.pdfIn PDF document text
    • http://mxbur.fun/father_forgets_in_marathidp0k9.pdfIn PDF document text
    • https://fukidupedogof.weebly.com/uploads/1/3/2/8/132814182/a5d4a.pdfIn PDF document text
    • http://carinsusa.info/what_are_the_five_process_groups_of_project_managementq5h1p.pdfIn PDF document text
    • https://maninidepot.weebly.com/uploads/1/3/4/7/134702581/judexepogez_zazefiwuwen.pdfIn PDF document text
    • http://bred-enligne.com/jodobogibuvojamidakoszuev6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_602b77b31070d.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/i5jjbAa/ludo_king_apk_for_pc_windows_10.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/putopomipijajag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 5664 bytes
SHA-256: 3eb3a3fe5f3bfecaef868b322d0bb16bef5ad5c5116b0ec5e7520ab6496ebdfd
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 9936 bytes
SHA-256: c48a558590612275212fcfccf3360080ae09615fa30e7e5f293dc76500ed0815