Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c87ba21706d47e…

MALICIOUS

PDF

73.3 KB Created: 2020-12-18 01:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1d94a7b5cf653f70632ca8ed93e2478 SHA-1: 75b9431660ef9d649318f3c329f7e35a54c85b9e SHA-256: 75c87ba21706d47e5ae4a0aa6f31a989945117fe5e9a43f0212e13b726c7ee20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://trafftec.ru/strik?utm_term=big+bad+wolf+costume+diy PDF link annotation
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/6d5db6ae5452625.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/9b14549441c9.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/lapomut.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/e5c5d0c92.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/e8597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_5fc2371e29384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fa776d65bf02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8bbd2d24f25.pdfIn PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/gozesoru-tanugawivabuv-liwivubid-kijufatasuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f8e7a2044ec0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/27829048360.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/hydrocortisone_for_acne_scars.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/anita_baker_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1b40f7-ff8c-4a12-bf1c-7f9d10548e62/38536983779.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/70374013862.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/euro_pro_sewing_machine_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e66a202-9ded-4f01-b026-e85325a94d97/7273930294.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_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 5628 bytes
SHA-256: 54f4b02d3cd924d2e1e7a6e889019cc006328c8b572652fd9999c88ac6bd1288
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10792 bytes
SHA-256: fe771412d549c3dfee224d19ff598d32b924a55d0a422f69b2eaea124ccc52a6

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