Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6844dc6c726786…

MALICIOUS

PDF

78.8 KB Created: 2021-06-06 12:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: caf509d2e844f7c05b32407fd6c46769 SHA-1: 1ed55b8a42d163fe61ad7bf72e1b402d77eb17bf SHA-256: 0b6844dc6c7267862dc3020292691a32011b1798325e2ec56dcbafd4f0a42a5e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://crophysi.ru/123?utm_term=europe+travel+guide+map PDF link annotation
    • https://dumamawikop.weebly.com/uploads/1/3/0/7/130740251/winojiw.pdfIn PDF document text
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/7930e896363a4.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/4dcbd849691b6.pdfIn PDF document text
    • https://sunapasodaveka.weebly.com/uploads/1/3/5/3/135330332/kifuwazira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ffa8ae7acb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd66705e1a9d.pdfIn PDF document text
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/gaxopefuvaba.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/dadf7589-cc66-4428-8dec-f92da90dd1fe/dokowasovenenaliwozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1351ed26-c2d8-4503-ae7e-a33c29540a4e/10.1_adding_and_subtracting_polynomials_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6c30b3-6a90-45e9-ac2a-5eb0e3a704d2/pretty_little_liars_book_collection_in_order.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/fetijoxemesutini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f62e11-98ce-4fc0-806e-395e33e242b2/temoxoj.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144428031/67346489835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3287a164-e331-4baf-961b-3a27f9ea8f3f/is_obamacare_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e4f174-29b7-4a04-9e2c-a475549a2010/hp_photosmart_e-all-in-one_printer_series_-_d110_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f130e7-078d-4634-a769-152382d600ac/92323748637.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_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 5120 bytes
SHA-256: 69652eca27181563ca38534dd0ca57ae7eb32309593ef005093d9029a3baeb73
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 11520 bytes
SHA-256: 976935fa6d2438b36f263cd5edb19bbd8994e321f3d161a37102868573be9900

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