Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6aaa0927841115…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 00:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2cbc64f6ce56dae5f9c0e4f4d3de8d9e SHA-1: b9d93c7257367979bd2d6bf07859f8d881c5443d SHA-256: fc6aaa09278411150185636147fb13d3f7d56311e63bb05266f46007314e3753
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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=jam+plus+2+speaker+pairing PDF link annotation
    • http://lobulezinovux.medianewsonline.com/10632814128.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/3379173.pdfIn PDF document text
    • https://jubuxazule.weebly.com/uploads/1/3/4/5/134585976/6581911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_604671a12f752.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/tagazob-tofubag-botuvivekuzefiw.pdfIn PDF document text
    • https://lavivatum.weebly.com/uploads/1/3/1/4/131437335/redexosopibib-vexasidadip.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/aluminum_boat_building.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/7063ba1d681b26.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/ti_ba_ii_plus_tvm_tutorial.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/career_day_questions_for_students_to_ask.pdfIn PDF document text
    • http://pokupka.space/american_government_in_black_and_white_2nd_edition_free5m1qm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_604838364e5d2.pdfIn PDF document text
    • http://tertov.xyz/sap_plm_360pmbpy.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/nematodes_parasitology.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/543baec3-eb85-400d-bf97-a776c73711e0/daxakizuxefimabasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0760d2c-d7b7-4cf5-91eb-5ed8d5b98f51/sukig.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_007cabd814504a77a1e7598ae5052035.pdf?index=trueIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_6f915668de7e4c3fb38e230282b5e765.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/004b300c-a322-4061-a53d-a75297e7030f/the_adventures_of_sherlock_holmes_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6bacee-0d41-4d07-8af0-466f99f723e0/what_to_put_in_a_primary_school_time_capsule.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_e63410359dca4993ad71d9ffe633c873.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c2a9d03-2414-4a66-93c6-662945458e34/56002490937.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_60824f7f080c4a3b961d2de489bfc1cf.pdf?index=trueIn 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_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 5324 bytes
SHA-256: 057cc76a7e52902c2b77f6d71d4af36206f6a6944047c51c9f8df3936e68eae3
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 11660 bytes
SHA-256: 27aa5cb1f97707d2ea94de7bb4a83b2059e0555af3870431ad48a6bf511f3d0c