Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e7868afd7e0026…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 05:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa7d5f7279404d56c67bc4ca346fa8ba SHA-1: 9be8aaa473db1bdda76eb0fa5e2dbf49b6cd15cd SHA-256: 99e7868afd7e0026cca37bd35b573745901c975bbbb7ac690f83770feeba0c7c
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to disposable hosting domains and utilize UTM parameters, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself exhibits characteristics of a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://golowaki.ru/aws?utm_term=how+to+refill+prescription+walmart+app PDF link annotation
    • http://dikegebe.mygamesonline.org/escepticismo_filosofico.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/somewhere_over_the_rainbow_original_recording.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/jaje44R/7459617918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6016ce59a5606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_6009e860a1439.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/calligraphy_practice_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_6033650ee62db.pdfIn PDF document text
    • https://cdn.sqhk.co/tazurusubiz/DqRJjbw/download_flappy_dunk_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/2bhejjT/mario_kart_guide_wii.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/zakamenexavirisurukuteb.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/benokosezof.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/jieXH9D/20047067459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_603b7ab696824.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5fcf84a4c79e3.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://s3.amazonaws.com/figidireki/sopijobewozagomazi.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/ultimate_diet_2.0.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_67b757dadb894a278605d419ccfc7c85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/formal_neurological_examination.pdfIn PDF document text
    • https://e0eed0b3-ca42-4d59-99ab-0bcda72edb80.filesusr.com/ugd/738632_5e6d02f5580f46399ac3184005572922.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/taurus_pt111_g2_upgrade_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/diwuputazedokedokuko.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 5000 bytes
SHA-256: 1235145734334a1465a5ae06c976c516649d8db78f0f73690483583528354098
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10684 bytes
SHA-256: ebe33b20f2b6920b98e9703034c70565b11c1969dfac5bb9fec2fa654bd47710
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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