Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17f7cc7b3fd3f64…

MALICIOUS

PDF

74.1 KB Created: 2021-03-17 15:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a3b68652c53157daf45d9135d5f668fd SHA-1: 861d7126a7557e8bc26fbe96ca9c43dea47d8528 SHA-256: d17f7cc7b3fd3f64c60843c3becfb731acebc4e3d0e1453d2dcae7e0f3171948
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=android+card+design+pattern PDF link annotation
    • http://nutristrike-shop.ru/tutipuxowurumds8p.pdfIn PDF document text
    • http://pixxel.life/sky_factory_item_collectorbylue.pdfIn PDF document text
    • https://xamatokixixite.weebly.com/uploads/1/3/5/3/135336409/0ef53cb17084c2.pdfIn PDF document text
    • http://afterdealer.pro/85234140743e6v4o.pdfIn PDF document text
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/novidure.pdfIn PDF document text
    • https://xuguxoxarakijob.weebly.com/uploads/1/3/2/7/132740494/vaverafofemigumix.pdfIn PDF document text
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/8236080.pdfIn PDF document text
    • http://nikaold.site/206520038918hnpi.pdfIn PDF document text
    • http://begemotiks.space/vaxutagijuxexenoviwanuzev49wf.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/886b21b3cb12.pdfIn PDF document text
    • http://creditstar-kabinet.com/zikaritukoldxog0.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/gogiwefu.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/4c333626.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eabd73d-fe98-41a6-895a-ca09fa9cec00/93949301401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766584e8-9550-4f57-b414-5ebcfcb9e841/libro_historia_de_mexico_2_secundaria_sep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7263f2-3e88-42f7-b041-a43fcd596333/27673019091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b9cb7f-3e53-4e20-99fe-3fc401be026e/how_to_put_factored_form_into_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1249915-de03-4dfd-8283-efb95fa5f0d4/57479727793.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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 5196 bytes
SHA-256: b3bbf1a64309fd40a899d02413f27258f1a4a0103e50e228a922298c6d7ef05b
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10524 bytes
SHA-256: e99c4f47c0cb0e8e1871048da4747916ee9f239a42bbdb3670cb721389c22800

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