Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c895fbb82b824e…

MALICIOUS

PDF

83.3 KB Created: 2021-05-20 03:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 91897abc77f7ec753959c5b903629a8c SHA-1: 266ec32dd834139d0222164d7babb7449251552f SHA-256: 75c895fbb82b824e73cd1c2ab1127f6a1c37c935be16d92fde37b433d3a2fae3
156 Risk Score

Malware Insights

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

The PDF file contains embedded links and a document body that attempts to disguise its malicious intent by referencing 'how to write a script scene'. The primary malicious URL, https://nipisod.ru/strik, is likely used to host a phishing page or distribute further malware. The PDF's structure and the presence of numerous external links suggest it is part of a link farm or a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://nipisod.ru/strik?utm_term=how+to+write+a+script+scene PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fd93d64acdce.pdfIn PDF document text
    • https://bikanagika.weebly.com/uploads/1/3/4/4/134461715/7afed0962ee.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/wuduwameboxip-fuvave-fuxuneful-zevuvor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6009ea2279962.pdfIn PDF document text
    • https://gupaxapofigovi.weebly.com/uploads/1/3/4/3/134356466/vobonazokixaxolomum.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/1e959d.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/eb9cf5d7-59c9-4906-be7b-1aa90d93de05/50092282302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8d4718-ad02-4d02-a303-2bee20fc86da/rafiparimeferolozanotewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fbd71c-5b70-4a70-8426-05de89d0b972/zirex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3a9784-f49e-42e7-9d73-ae8a6a305f16/nikon_sb_600_vs_700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e016414a-9ff6-491c-920d-83ff247eb78f/917201345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3728d4b8-b23f-40ff-ba6e-496c50425b0e/why_is_it_called_supranuclear_palsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881eac1f-3c56-43a6-9f03-75eb50921574/analyse_and_evaluate_data_collected.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1907da57-aded-4c1c-a2a8-52a9f4afcc78/76981432296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085a6a68-2cca-4051-92b8-0f9c28b161d9/kill_team_starter_set_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9156d2d8-c063-4122-8263-6c504bd07d7f/total_quality_management_definition_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d652f26f-d8a7-4ca4-b08a-0eaf496e1432/ordering_your_private_world_study_guide.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_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 4948 bytes
SHA-256: c84a595eff2e53aaa8152ba32bf86a01d93fefd10a84aa3174ef2b5e7342a34e
font_01_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 11124 bytes
SHA-256: 0482a19595a4602598176b87b2bcc4f2d67d3aa0aaed6da4a8660543fd712d26

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