Malicious PDF — malware analysis report

Static analysis result for SHA-256 31758426b791a64d…

MALICIOUS

PDF

50.5 KB Created: 2020-11-08 15:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 800f6ef6509aa7fc7004233029d1c3be SHA-1: bb82c1ffce4827b461cacd59f6990bbc297a118c SHA-256: 31758426b791a64d8f4ab3590ecc60fe998308379090b7ae4159c753c3620523
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a deceptive lure, such as a fake invoice, to encourage users to click these links. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffset.ru/123?keyword=utopia+property+management+california PDF link annotation
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/6589395.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/bofikamatunaxexifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5f9376f9323a3.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/04d6b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_5f9d5e79e9d25.pdfIn PDF document text
    • https://sijazeresivex.weebly.com/uploads/1/3/4/5/134502522/jewamofop.pdfIn PDF document text
    • https://midazumetewafaj.weebly.com/uploads/1/3/4/2/134266273/kegow.pdfIn PDF document text
    • https://kavimexidulivi.weebly.com/uploads/1/3/4/0/134040988/fe2beb09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5f9a22b66bdcf.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/a1a9d.pdfIn PDF document text
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/ratadaso.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/2141a4d1.pdfIn PDF document text
    • https://damafofazawarag.weebly.com/uploads/1/3/4/3/134369947/dexigejo.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/nukexixekov-lokuxorolo-muxasadafuxi.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/xabalaru/runidumebazane.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/short_story_english_download.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B4 5248 bytes
SHA-256: 440821ffe8ac44c20b0cb0e88720e1f0dac334ec0987f8fd3120e2dbe79292eb
font_01_sfnt_off0000998a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x998A 10408 bytes
SHA-256: 99d552cc868216cc4910f54eb76a7fe4736807021142707a66a2bf108e0a034e

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