Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4f484d5cef6085…

MALICIOUS

PDF

90.0 KB Created: 2021-04-05 02:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ebabb05d557fedbf94d78d2407296249 SHA-1: 095498e59013345caac36902f6a86975b3214bb2 SHA-256: fa4f484d5cef6085975ee707c626794e0439ccbfdba00065c5ea7494f9da12dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=hans+wehr+fourth+edition PDF link annotation
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/somepewopekonew.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/17480054531.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/xebivo.pdfIn PDF document text
    • https://pirebuvix.weebly.com/uploads/1/3/2/7/132710697/1483104.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/56538519310.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/4804025.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/menedaxeni.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/79622197872.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/717c14cd6a686.pdfIn PDF document text
    • https://xazalonabi.weebly.com/uploads/1/3/6/0/136086847/bd4fea48c51d6.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/jazasemizenubilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_0656ec1ca9d74c2693d0c93c15eb7fb2.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_a4e1c8a396754c5d9f430015b90bcf75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb403a6-3608-4a6a-b089-32bb96ad610b/23847512859.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/32084799325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1b6fd3-0213-4339-8141-82a7f20c0478/hosanna_marcos_barrientos_acordes_am.pdfIn PDF document text
    • http://xefujuji.rf.gd/angina_estable_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e427c506-4e39-48f3-ba67-c9e8d0967884/fundamentals_of_nuclear_science_and_engineering_solutions.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_25ad66c749544e02b134917aa3d50a5f.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_58222587ebaa495cadaede29da3b5ea2.pdf?index=trueIn PDF document text
    • http://lemizirimafon.epizy.com/sowulelofiro.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_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 5016 bytes
SHA-256: a69dcbf0533aea7325b2ffcfe2c59b164af751f5ef148d9bd79ea18cfdcee0f2
font_01_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 13312 bytes
SHA-256: 12f538c376c74631cbfd6b800f8e3c9dfa191a139faf0ff9fe3f13b1ed71e754

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