Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43cdfa94df90cfa…

MALICIOUS

PDF

71.4 KB Created: 2021-05-13 15:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 539e51c635d25c0a6c8eb2508b83625a SHA-1: 48442a2de195a92a16063496065bc7fb0cf23888 SHA-256: f43cdfa94df90cfaeaceac4aa3711db272fb20a4fee5b8debc021c63150a0246
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are suspicious and point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to 'Onn clock radio set alarm', suggesting a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=onn+clock+radio+set+alarm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409623/normal_6017ab2f97242.pdfIn PDF document text
    • http://daddytestit.xyz/64079682229umvxw.pdfIn PDF document text
    • https://rexuvaxap.weebly.com/uploads/1/3/5/2/135297240/tonaxivatulel.pdfIn PDF document text
    • http://musc-media.xyz/11242439845mwfvx.pdfIn PDF document text
    • https://voderixata.weebly.com/uploads/1/3/4/2/134266977/9fc45cc.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/2956850.pdfIn PDF document text
    • http://tryse.xyz/kavoxilipoponidefijafisowt168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_606441098cea8.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/govuzutokebal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_6068d10ff37b0.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/xowunubo-fasodaboneferi-fudato.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/matogapibelifiv/bonoxewukow.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_49b58d1fcc7d47d9ab3d2b0d457c0038.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/winrar_latest_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/five_nights_at_freddys_2_game_free_unblocked.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_c45f6487f82f4f54ac5f11f2dfb4a5f9.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_1744c425202446c584d405cc11020aa0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabom/dsc_pc1832_quick_start_guide.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_f317e7ec152b4d61b2ecbc220c95f4fd.pdf?index=trueIn 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 5176 bytes
SHA-256: dc81c051ea98c421e1a890d0d4f6002fffc3e03f2809f7f686a2be338cece8f3
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 11040 bytes
SHA-256: e4b0ea2012600a53987945eab53c70d592d03a5db04421d22bf514629c289bee

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