Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae111009a087792d…

MALICIOUS

PDF

68.4 KB Created: 2021-02-27 19:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0bb1980eae7e11f7990fc226f111988 SHA-1: 233616209b2185d520530ac5cce68087d1ae3947 SHA-256: ae111009a087792d7f53e48635920ecd56c59f50548deb1b6a224dbd7d13d0e5
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The presence of numerous external URIs pointing to various domains, many of which are disposable, indicates a likely attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/wix?keyword=grand+theater+hattiesburg+summer+movies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421201/normal_60199fdfce814.pdfIn PDF document text
    • http://like-store.site/satoluvbwznj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_600adaac0a9c2.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/whirlpool_wtw5000dw_wont_drain.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/pimuleruzo.pdfIn PDF document text
    • http://vowazokisexe.22web.org/91813986316.pdfIn PDF document text
    • https://zoxofaduw.weebly.com/uploads/1/3/2/6/132683138/togaxepuzowige_wobelamof.pdfIn PDF document text
    • http://3gusevshop.space/40104776436t1yql.pdfIn PDF document text
    • http://zogavigubemu.iblogger.org/84543096642.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/acute_asthma_guidelines_pediatrics.pdfIn PDF document text
    • http://kushtanash.ru/hawkes_learning_viewing_life_mathematically_answersuh1h6.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/jazaxoxagiv_madijalipoxomok_jepuzobupudesim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fe3c7e422e7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fe482cca943d.pdfIn PDF document text
    • https://kosofisipituje.weebly.com/uploads/1/3/5/3/135329454/rubid_duvad_debavibupukus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://valamujunitun.epizy.com/niregod.pdfIn PDF document text
    • http://furalepoju.rf.gd/54546684808.pdfIn PDF document text
    • http://mujujilunel.epizy.com/gakogisiru.pdfIn PDF document text
    • http://bawokexumavi.epizy.com/bdo_leveling_guide_56-_60.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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 5436 bytes
SHA-256: 309fdebe72218efbc0774db5ff45ef0d4a3a4c6b995de7510a807a6c36ea0ee9
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10096 bytes
SHA-256: 6cfc4d3dad28cb82b9046d2b4a21598d06ee1053088d2fac89354b9996e8861a

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