Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8d8e7dd6a8fd76…

MALICIOUS

PDF

107.8 KB Created: 2021-02-23 23:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c64911a0bc0a9a18a7e0594b2fc6f971 SHA-1: 251aaad2d5e169a5ad3bd280061333559134ecd8 SHA-256: 1a8d8e7dd6a8fd76430b8fb527124df691d5fec00664b74ef6bc526c93371b4c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://jottigo.ru/123?utm_term=how+did+the+agricultural+revolution+began PDF link annotation
    • http://stikc.xyz/mofuzoriny36z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_60305a5979443.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/VHjfgiI/jared_harris_movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_600cef3823116.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/fKijiic/13133698630.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/mizitugam.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/gdgdcNp/79393213350.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/011d9dc96cd378.pdfIn PDF document text
    • https://vegalatunom.weebly.com/uploads/1/3/0/7/130776393/xiwulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406216/normal_5ff586643639b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5ff5f109ccbc4.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hdBhbXX/high_speed_racing_car_crash.pdfIn PDF document text
    • http://opt05.ru/tejogobatiz167wo.pdfIn PDF document text
    • http://blankid.ru/vejoforaxisipuza0fqrr.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/iWz2eJ5/jifexisumuvupasere.pdfIn PDF document text
    • https://sinuvofibudibaf.weebly.com/uploads/1/3/2/6/132696377/0bd2f8c.pdfIn PDF document text
    • https://sabewuxibiw.weebly.com/uploads/1/3/4/7/134718514/26df0baa3.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/ijejgL2/gulipafo.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/bosidrtz8q.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/sesijesule/broiler_breeder_management_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/autodesk_vault_2018.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_off00016b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B11 5276 bytes
SHA-256: 3781009470fcc7899fce579aa80ba13f2a0c8eeb899fb5e3c6e642dd7545f62b
font_01_sfnt_off00017d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D16 10736 bytes
SHA-256: 8935df020aea0f00a7f375dcc47f71738581586b0b62bd9674be2ac020db3b3d

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