Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ad64cffb5d6cb…

MALICIOUS

PDF

45.1 KB Created: 2020-10-07 03:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 78c994d0304f2bdec14169306def17fc SHA-1: a13e28c2021d69b47b2c7c652e1fb24351f4bcea SHA-256: e58ad64cffb5d6cbba4261440ca88d0656f89fff36250bd018e9244cabc4a421
184 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a tool for converting scanned PDFs to Word. The presence of a link farm on disposable hosting and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=convert+scanned+pdf+to+word+free+online In PDF document text
    • http://files.be2win-bd.com/uploads/1/3/1/8/131856271/gibufafunulokogape.pdfIn PDF document text
    • http://files.msbronson.com/uploads/1/3/0/8/130873894/likilinenumaxopeto.pdfIn PDF document text
    • http://nifine.empirecoffeecompany.co.nz/uploads/1/3/2/6/132682156/7f527d061674d.pdfIn PDF document text
    • http://dogil.andreasyoga.com/uploads/1/3/2/6/132695584/60183.pdfIn PDF document text
    • http://files.vancouvervolleyballleague.com/uploads/1/3/1/6/131606556/zopod.pdfIn PDF document text
    • http://files.marystromerhanson.com/uploads/1/3/1/3/131379655/sesama-fitamakekoxe.pdfIn PDF document text
    • http://files.fossilridgetheatre.com/uploads/1/3/2/6/132681664/512b94f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8381a7e8-770d-4dcf-9b9a-d0f6018b800c/kazotokazubomigupikunepot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabfa3a5-7a31-4519-9f36-96640a21992c/jifiwerumasek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a8c7c3-a3bb-4f2c-a4b1-0db1a9e70f7a/ridusedasolipene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3c2c8c-bbd0-4205-a9f6-338bf041f0b1/18028555920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c492011e-b08b-4f87-b9e9-6566e9bd3718/25815118064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c25f3c-d90c-430a-85c5-6648034d579b/bufazujizuzimotikufekorex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d493dbfc-a0c2-4f29-a6ae-dc66162dbc5b/mumeliluvuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a0a49b-5ff4-4017-a347-eafa5271958f/31384164183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44dfea88-08cb-496a-bfee-5abf180405f3/rasibixixavekinilab.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_off000072ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EE 5204 bytes
SHA-256: 5f8d8a024f929264a37600b42cc997705563c11bccdefa82793a71aa1c80380d
font_01_sfnt_off000084c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C8 10148 bytes
SHA-256: 99b8a5df819e9aad12c671420b8f7e135570a69975a3bbbb703505906b0efec3

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