Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa13f91db3a6702…

MALICIOUS

PDF

60.1 KB Created: 2020-12-01 04:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 16281528530520d209cf0b1d59f96c9c SHA-1: 93a67568dcbe6c189c7158149685f7da5cf2310f SHA-256: bfa13f91db3a6702abef33a4ba7bc93e72044772d9e38f3d975bb25518ab5bf8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=lesson+2+theory+of+evolution+by+natural+selection+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5faee65355068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f93d27e146cb.pdfIn PDF document text
    • https://fakuduvedutew.weebly.com/uploads/1/3/4/8/134866980/laruliw.pdfIn PDF document text
    • https://fixumimudojuzu.weebly.com/uploads/1/3/4/6/134607797/3645973.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/vunilulebaliga-kitoxilotuwuvup.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/nepifasofop.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/6990024.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/391c6e19-b646-48eb-a4fe-bf8095b9a08e/cal_poly_slo_football_schedule_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/7311218176.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/legezesikusepivulen.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/kalendar_kuda_2018_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/android_21_x_male_reader_deviantart.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/45325027803.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nemixejuzekavifebilad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d970b24-5e5c-4ace-9568-98e58063514f/download_when_a_man_loves_a_woman_by.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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 5500 bytes
SHA-256: 888241366b7e09ab2a5f1a9a8c315e550f6f540b195c79aa00aa2cebd96b53b0
font_01_sfnt_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 9804 bytes
SHA-256: 5ee1ec0ad5ca9e1fb2bdcdc9ef74f5ea7182295283060bf45a64902f5d7ca9c6

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