Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafb9faf676b68a3…

MALICIOUS

PDF

103.6 KB Created: 2021-04-11 01:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f7f69dbdb74aa822364d1a093d8ecfc8 SHA-1: 9d9243c2f96f91acfc7c089ab1cc252d009bcdd0 SHA-256: bafb9faf676b68a350aba23b1bea7e9a0806fe8e92f150175d7fbfe1f7e7da0a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jumiwimov.ru/strik?utm_term=what+is+the+story+of+rumpelstiltskin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369179/normal_604976bc8f9b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_60661d3cb5c29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fcc3f2352a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393635/normal_5fef01bebc47f.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hjhWicb/walal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6018db6a82e6b.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/XiiggG1/85363379563.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/zaregaravilopetabeweri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fd918d144933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fe1a66abed75.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/what_is_hell_in_norse_mythology.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/krishna_yajur_veda_brahmana_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_601b5c6ca0d4c.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
    • https://a539eca0-ed6d-4e39-a9fd-63162facd464.filesusr.com/ugd/8170ee_7b651ec432484790853925d279a1b399.pdf?index=trueIn PDF document text
    • http://nibubatovavav.atwebpages.com/46723509388.pdfIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_24130455d29b48a894339c7841d53940.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_795e239853b2429f86e7e7b80b8fcc37.pdf?index=trueIn PDF document text
    • http://bosagiriwamokin.onlinewebshop.net/data_structures_and_algorithms_in_swift.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_c2ee0482e0d24d0eaefdfdb049e992c8.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_0fba26d66d7a4cf888611dc8265a054b.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_7a9e186f61a34191a47fce45379bffa8.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_0dbb0b5cfdde4c549e40169abac1830b.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_fabab49c05954ee4bcac6cf64d886959.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 5400 bytes
SHA-256: cfe6cb2f12d980c3e07d56cafd31bebdb664c1adce680bc0b57c2a3e4decf73c
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 5200 bytes
SHA-256: b1fe430f799c35bf42cc85390eb1b17c23ccf1eb5395c0ec8127f2b89e3b3d76
font_02_sfnt_off000130e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 18976 bytes
SHA-256: b21bd03d75e0b56746782879edd1a5d19195783aa3d10de10debae0d9a1a1312
font_03_sfnt_off00016907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16907 16660 bytes
SHA-256: 6b64381c1462f33fa1c0bd7166f61e029456cbd0282f5aac94f53ee02dbe9f80
font_04_sfnt_off00018039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18039 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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