Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff54eb0dd237ac92…

MALICIOUS

PDF

79.5 KB Created: 2021-02-14 07:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eda01fa22e38437493c129ed5b2b7f4f SHA-1: bc3e9f7bb0a0312d5c7ff969ea8612f7cf12be3f SHA-256: ff54eb0dd237ac92a0af0ae80aa51358be5ab4ff8ac4b93f86a7dfff81693d54
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, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, appears to be a lure related to 'spoken word poetry'. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs points towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=spoken+word+poetry+near+me+tonight PDF link annotation
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/4664316.pdfIn PDF document text
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/zorilasipi.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/pekevola.pdfIn PDF document text
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/f90547a90a491f.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/sijepowo_lazaloxamurut_mevodusuruverur_mimido.pdfIn PDF document text
    • https://zidoboxeped.weebly.com/uploads/1/3/5/3/135324118/2723243.pdfIn PDF document text
    • http://lifegirls.site/25711556495vo2om.pdfIn PDF document text
    • https://kunuxuzuvedenax.weebly.com/uploads/1/3/6/0/136051690/buzomofoj-nodod-lipetowajotuxe-zujer.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/pirufudire.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/cfcf25f92552f1.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/jajfvhd/30556416504.pdfIn PDF document text
    • https://vifusixediw.weebly.com/uploads/1/3/5/3/135312005/rovanesirezizumisewi.pdfIn PDF document text
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/wopabuza-xudumub.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/kofuwavokisemugetemu.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/menebiwisiwolag-momapadase-vekatufotegavo-jazupoboxizuro.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/4475906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5524 bytes
SHA-256: b12210aa68b64d3886af4f7f04fa59702387b708546c6c57b0f2c823afd401a5
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 13736 bytes
SHA-256: 362cc1c1babc11a902fda68a24264a87dff15ae7e8184452a077826a898803c7

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