Malicious PDF — malware analysis report

Static analysis result for SHA-256 3524e83a5f14cedb…

MALICIOUS

PDF

73.6 KB Created: 2021-02-17 15:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 648f15689605888698e63ac6c38bef70 SHA-1: 9c2497cb4e7278cbd21dab79391e3c7809950547 SHA-256: 3524e83a5f14cedbff4b45cbccc8f8ecdc5ca192eeed99c69a8e4540d740786c
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 hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to vehicle transfers, directing users to suspicious URLs.

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://jottigo.ru/strik?utm_term=que+se+necesita+para+hacer+un+traspaso+de+vehiculo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5fea2c88a82cd.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/kixanipovop-nupawof.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/letagujiludad.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/tubuwogedubaxisuma.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/savivoromosuzuzokibi.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/1293922.pdfIn PDF document text
    • https://tomumexajozovod.weebly.com/uploads/1/3/0/9/130969356/89dd97f02115f55.pdfIn PDF document text
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/jodepujobumivog.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/vozebatitikan_foguzob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5ff7d05978419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_6007be0922069.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/legapatatezisa/html_stylesheet_css_link.pdfIn PDF document text
    • http://soxixebupi.rf.gd/43658734769.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/personal_health_budget_application_form.pdfIn PDF document text
    • http://metukobitoro.rf.gd/sixepiwegiwopikujinim.pdfIn PDF document text
    • http://temidegizesoweg.rf.gd/kemug.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/fivegiwadexoxoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/68329205321.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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 5280 bytes
SHA-256: c9ca40613bf2122480302a0d112a6a558c204d1751e94d6c5f5dea4690d40646
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 12020 bytes
SHA-256: c79827560da2d3b902e77abe1e08870fa920b944bdefa35aa7abc9a95a20a2cd

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