Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d997fee381c89f0…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 18:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 010956efb84e4194431984b8e9f1d082 SHA-1: 24ab5390ba9954f54e4d296f4c317631a98f1910 SHA-256: 5d997fee381c89f0fab416ca3071c8f490c3386100d03acc785788095dac9ac5
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO link farm or phishing campaign. The primary URL, https://maypoin.ru/strik?utm_term=what+is+my+political+ideology+quiz+uk, indicates a potential lure for users interested in quizzes. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=what+is+my+political+ideology+quiz+uk PDF link annotation
    • http://vanimerukaguto.scienceontheweb.net/rijuxufofa.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/tetirusekeg_kugele_sarevitul_somelufedi.pdfIn PDF document text
    • https://lanizozegew.weebly.com/uploads/1/3/5/3/135309184/doxodabezegumegepese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_601d75e3811ca.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/6152478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_6010d55a67fca.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/c79f9ba.pdfIn PDF document text
    • http://pewujok.mypressonline.com/directions_in_sociolinguistics_the_ethnography_of_communication.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/6e2da53c990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/libro_el_cerebro_de_buda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd28c94-03cc-4008-af40-d575aeee5469/power_precision_cooker_error_code_ee1.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/juwisazimizetasesubexakul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4945085-5d24-4aea-be0c-faaee151a7fd/45229599655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7fd724-3ef9-41db-bb9c-9ee6d7ba084a/samsung_soundbar_hw-e450_remote_codes.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/what_are_human_factors_in_healthcare.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_cbecb9fb682e41848c058ca0108e640a.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_8a2c696821fc4d0c96a4a413bff6d199.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d123421c-65c6-499c-8721-8545c55c6bc8/85376407917.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_1c26fb45b77a47d4829775dd121111e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8640885-6db4-41c8-afbc-71d7fb1de505/78931266108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21005186-076b-4af3-b807-a478aba2f69f/8062984766.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_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 5744 bytes
SHA-256: 90764b9deff79af1c017fcd38bf4bbb64b57fa733ba9cfd73fee015556c54ff5
font_01_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 10408 bytes
SHA-256: febf48efd390df67fa473ba5e15a6c650034e87b989ff091144a5d5614699023