Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cdf7e30463a5a0…

MALICIOUS

PDF

34.0 KB Created: 2020-11-07 07:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dfae8cb3bd984c8cf51170d47a3a33f9 SHA-1: d3a1731ee8975db5e68228e3df7272e763e0fb2e SHA-256: 92cdf7e30463a5a09224a558d61035c1e63d569ea80e0b707882831c106e3e92
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://trafffe.ru/aws?keyword=flinn+clinic+in+memphis PDF link annotation
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/jorapimara-bekule.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/23822c.pdfIn PDF document text
    • https://dikosunasalimob.weebly.com/uploads/1/3/4/3/134363034/2655092.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/gusopoxuxokazew.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/f0196eedf.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/tezofuretejom/salvation_by_langston_hughes_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/vuvowozokugokajuluku.pdfIn PDF document text
    • https://remezutopuze.files.wordpress.com/2020/11/pibag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f00425-2c04-44dc-aceb-71e56d2b8ebe/champion_4_toilet_flush_valve.pdfIn PDF document text
    • https://zetetojowu.files.wordpress.com/2020/11/makekebivuveb.pdfIn PDF document text
    • https://namufez.files.wordpress.com/2020/11/74925906713.pdfIn PDF document text
    • https://degareke.files.wordpress.com/2020/11/15697771868.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_off0000482e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x482E 4824 bytes
SHA-256: fb4849f5d091e8af7ce909df8fbc861f784058babd60b691b257391bf7801576
font_01_sfnt_off00005876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5876 10352 bytes
SHA-256: 9f98d8f0e9189588ce667541b34d274020d0d65b5dd507b2b2a05563d2a49c50

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