Malicious PDF — malware analysis report

Static analysis result for SHA-256 948a4b1fe6bad4a6…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 09:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b43dedb5f9e43ddb0884c2bb9743b957 SHA-1: 5a623b73a564cbe82b19ffa27a6fdccac18413f6 SHA-256: 948a4b1fe6bad4a6d4e9ea5d283ff11fc04fb3e94cebefa839e2a9e0a08d1755
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be SEO manipulation or distributing content from these numerous external URLs. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly suggest malicious intent, possibly to lead users to malicious sites or to artificially inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://vilenefex.ru/award?keyword=vivaldi+winter+violin+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/lapefuxolu/gfgchjh/37132273574.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/x3Hghji/41263481921.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/ohaihhj/4922470166.pdfIn PDF document text
    • http://salonop.xyz/manualidades_para_hacer_con_nios_autistasugyfr.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/giwZRhW/birthday_cake_images_for_baby_girl_with_name.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/kFNxgiL/84939190927.pdfIn PDF document text
    • http://brumbum6.xyz/gadukuvotedesemawumimexebjj72v.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/21524662625.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/pawolaworivakobako.pdfIn PDF document text
    • https://cdn.sqhk.co/tewigoju/aBjiOvt/42764555653.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/exCgz1H/71240354916.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/fuzafuzeruwit/3115433796.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/arab_spring_adalah.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_50e0671bf7b74c839cd788a69ee6224b.pdf?index=trueIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_3e01698dfdb0470cb19f97b7d541083e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/48947780433.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/appendix_formatting_apa.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_abc0592b8faf443ca3001bc451bcd601.pdf?index=trueIn PDF document text
    • http://zogoxuf.atwebpages.com/70531389087.pdfIn PDF document text
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_9435911e2a1e40b18034d90490d45b00.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5512 bytes
SHA-256: a6c9aec77e9ed516addf9a9b052ab70a70dc2df86008e401b2c64bc74d104bdb
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 10752 bytes
SHA-256: d5750cd7829182a9d1997207b7c6735c8ba5a192835f47d5b606d2f964e2f86a

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