Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa6aad94f4754fd…

MALICIOUS

PDF

43.7 KB Created: 2020-11-07 01:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 155ec6d7125c8c74c32aee7ec336e185 SHA-1: 9d2510d1fd566a1d694e31ba6740df44821f6d29 SHA-256: 2aa6aad94f4754fd49adc96dcb92dab28e73dbbb9a27fb0dd9c59b28a31ebb19
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 1.0000

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://traffine.ru/123?keyword=turnip+greens+recipe PDF link annotation
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/tefukumibo.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/4442380.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/favove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://tatosotodu.files.wordpress.com/2020/11/wakiwezawuve.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdfIn PDF document text
    • https://saridejawe.files.wordpress.com/2020/11/95057248726.pdfIn PDF document text
    • https://fuvubuteluk.files.wordpress.com/2020/11/segeduvijapuduv.pdfIn PDF document text
    • https://rigimep.files.wordpress.com/2020/11/anthologie_de_lhumour_noir.pdfIn PDF document text
    • https://salemug.files.wordpress.com/2020/11/fifidekitubofurafowokofu.pdfIn PDF document text
    • https://mabimufifu.files.wordpress.com/2020/11/bon_voyage_french_1_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b21ccf-5efc-49bc-8618-95577373cafd/dobuvoxomolonimomokefab.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://zogidadovo.files.wordpress.com/2020/11/wapesewerutoritaza.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_off00006191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 4500 bytes
SHA-256: 94d5e6747a20184b671925429b1a4e2b281b5ff34f040e76015dea3e3c1e6db7
font_01_sfnt_off000070de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DE 10416 bytes
SHA-256: 80caf7e295f724244435039e5478b60a3c2a466575c9872e263ce69df3975f2b
font_02_sfnt_off00009464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9464 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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