Malicious PDF — malware analysis report

Static analysis result for SHA-256 164e69f9452b1b73…

MALICIOUS

PDF

54.6 KB Created: 2020-11-08 10:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0132ae4fc02b16a812e6447eb62a8956 SHA-1: 9ab309f84023fe72147df2a8894976a38be55342 SHA-256: 164e69f9452b1b73adfd40ea11f32c0c22db58c5a98cd6c024cd6d891c2d7cfd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting, indicating a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffnew.ru/123?keyword=town+hall+9+base+layout+with+links PDF link annotation
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/sapodejuk.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/1865165.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/korawufatekolap.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/lipazudow.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/nemuxevepogenebav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc66467-e56d-4e63-9a71-11933187cabc/kodaxiputigivowaja.pdfIn PDF document text
    • https://mijejuk.files.wordpress.com/2020/11/vilaweve.pdfIn PDF document text
    • https://vuvelowol.files.wordpress.com/2020/11/the_colour_of_magic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818e7959-e7ec-41ae-ae52-d960b04c7bfc/98033544705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744dc71c-9381-4969-bfa2-d680885d0ce2/tosolesizakizanimalipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43076b77-8ba4-4da6-866a-cf258b81b4c8/83511768533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83619fa7-410f-427f-888f-3d7f16ccbf6d/35471428952.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/20911819389.pdfIn PDF document text
    • https://wasuxazul.files.wordpress.com/2020/11/jexiwafurixezozumim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E2 5180 bytes
SHA-256: b860899bb50bd6f82e6a64ae73bd6352e9371582884575d7fa924226cc16979a
font_01_sfnt_off0000888b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888B 2492 bytes
SHA-256: 582e301813b7e08f79fc5905d2707b202b264211940cf2203bfcc4e694eb57a5
font_02_sfnt_off0000934b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934B 10424 bytes
SHA-256: b0755f20a97b6db2516f32645819d4c1876287f5b9ee0189e2312bbfd9b63ec4
font_03_sfnt_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 16232 bytes
SHA-256: cc032a1d7efe9f52c63bdca4360dad9aff78fb14a47167d9e0089e6cc9416013

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