Malicious PDF — malware analysis report

Static analysis result for SHA-256 09391a4ec0312e72…

MALICIOUS

PDF

111.3 KB Created: 2020-12-27 09:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7e7fde52db3b14502709a1b7675ba1df SHA-1: 9d56193d5ccdfd52870468c9dc6d6f4bb3877676 SHA-256: 09391a4ec0312e72945d89b980058a96dd9357b510dd7d936e3624745e89a1f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable platforms like Weebly. The ML classifier strongly indicates maliciousness. The embedded URLs and the heuristic firings suggest this document is part of a link farm designed to generate traffic or redirect users to potentially malicious content.

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://trafffe.ru/123?utm_term=dominant+genes+traits PDF link annotation
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/499725.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/OR2nift/18366803715.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/livunuruzeveg.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/f1b7814d9f7.pdfIn PDF document text
    • https://nubazodakop.weebly.com/uploads/1/3/4/8/134850303/9f13f7.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/bexedarinozir.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/589dab8.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://uploads.strikinglycdn.com/files/ad36090f-2fbe-4f6a-8630-c4ee06189866/80592941435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db8acd7-7d4d-4a8e-923f-901026938679/ninjago_masters_of_spinjitzu_episode_98.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/4657635051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e7be21-6064-4a18-a190-48980dc1bba5/quiet_leadership_style.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_off000168af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AF 4760 bytes
SHA-256: ad278251add567ccfe5165f1c0c28060c8fdf5231132443ce8f0696e456dd675
font_01_sfnt_off000178b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B9 12252 bytes
SHA-256: 69cee43146bcfe2894b5397480f445578811d5081575830e297e9bf1e9e0a7eb
font_02_sfnt_off0001a259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A259 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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