Malicious PDF — malware analysis report

Static analysis result for SHA-256 771c0ade0137b716…

MALICIOUS

PDF

115.3 KB Created: 2021-06-08 18:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c0c75a37d81a9f710b8d9afd31536934 SHA-1: 22e824100998ac9e956f09b22fad9004557da5fd SHA-256: 771c0ade0137b716e84c97f6fa9048601fb30d2d38ceacf22b49081036dce3aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/pbw?utm_term=crayon+shin+chan+movie+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451348/normal_604e16d8cb5ba.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/4a90e.pdfIn PDF document text
    • https://ramunigifobix.weebly.com/uploads/1/3/4/8/134891190/6817366.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/5de699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601f58959f06d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5ffaaf19698d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_6066791c74c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_6038b47de3601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_60bbc26b93c5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5ff7d7fc83964.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/mowuvigulisetoz_belowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_60415991606e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_60354be5a8872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozegajamuf.pbworks.com/w/file/fetch/144781983/emulation_ritual.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144458811/manual_taller_yamaha_raptor_660.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144606660/rufukodun.pdfIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144528912/jewimuvozigixuf.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144515016/56380390153.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424209/how_to_forecast_cash_on_balance_sheet.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144474522/17280151203.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/modeling_exponential_growth_and_decay_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 34016 bytes
SHA-256: 01808fc2e5be5c9e0328f1a2b963f292af379bca32f8d6fac3f9232fb909b695
font_01_sfnt_off00018757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18757 5108 bytes
SHA-256: c9cf115e642c487b75e3be92adf1ea28130a6a6a73ef1940a44cfcefecce8556
font_02_sfnt_off00019892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19892 11140 bytes
SHA-256: b18b21ab9b8e9da871fbe1694e482a0653432b4df33851c473c477378c75fdea

Open this report in the interactive analyzer, or submit your own file for analysis.