Malicious PDF — malware analysis report

Static analysis result for SHA-256 a786a431e4634811…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 07:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: efd168a05914e45818815e0d8ced93eb SHA-1: ed6420ca1fce8d7f092fc0b44d53da19747b562f SHA-256: a786a431e4634811ec9cf1ef83998d1508c982f35d648512425d5cfd6d638dd3
106 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by a machine learning classifier as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of many external URIs suggests an attempt to redirect the user to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=how+to+factory+reset+dsi+without+parental+controls PDF link annotation
    • http://souve.me/penobufixapes7tzvl.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/sat_english_grammar_practice_questions.pdfIn PDF document text
    • http://losqutoq.online/20256940611dcpf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604f6592e006c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_60135dd7a627b.pdfIn PDF document text
    • http://helpcreditscore.info/how_to_write_a_pre_lab_for_chemistryoo0wz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6042edc820ae3.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/how_to_locate_a_furnace_filter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_6009319262a09.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/tademuvejuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_601f76d16ed51.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/94799810166.pdfIn PDF document text
    • http://fitdieta.com/what_is_ziggurat_partsc2rq0.pdfIn PDF document text
    • http://50off.pro/68035454256indt3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_601976b69faba.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/systematic_approach_to_income_tax_by_girish_ahuja.pdfIn PDF document text
    • http://ourfanz.com/73345809285emjvu.pdfIn PDF document text
    • http://edevletorg.com/wabovizorolovoxojonejenekftmh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6041a4de3c10e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/93037866116.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5396 bytes
SHA-256: 8909d792b9de2db28824f070aedf632129a61fd2074a9b98ff49c1006538e141
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 10372 bytes
SHA-256: c1bb0e875d796969f160f47102e34c2b381144cc5b636e7e09430f49f0f8a29e

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