Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d761245468f6c5…

MALICIOUS

PDF

69.3 KB Created: 2021-03-27 14:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b01a9b3c323aa42f0da48217c2831c95 SHA-1: c2de0ba120ce4876fe2e10672acb09c6b008dcd1 SHA-256: b3d761245468f6c5b758f958cc71c225e89471fc50a6355aae2debf56ea1b736
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure.

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://bologen.ru/award?keyword=flowers+for+algernon+vocabulary+pdf PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://exampl1214.com/mnemonic_strategiesyyf8i.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/xalufabobajaraxugimugilo.pdfIn PDF document text
    • http://tegor.xyz/52081369260qug2i.pdfIn PDF document text
    • http://55571.ru/95402953463ndvvt.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/android_1_modded_racing_gamesgz9nh.pdfIn PDF document text
    • http://magic-spring.com/the_transfer_of_heat_through_matter_by_molecular_collisions_is_called8sg74.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/thermador_wine_refrigerators.pdfIn PDF document text
    • http://copyright-help-report.com/geratijiwapopidekogunino72qb8.pdfIn PDF document text
    • http://claire-irk.ru/critical_thinking_books_for_middle_schoolil23e.pdfIn PDF document text
    • http://wei-nmvc.com/88146050380b1t2m.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/2205040e-ef8e-4a24-b875-3f6ca6fccccb/how_to_retrieve_messages_on_panasonic_answering_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62a5ea3-74e5-4718-b8a2-a072541eaa91/7437797687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc42dfc-032a-469e-8533-e3dd2ea871da/first_grade_free_printable_christmas_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99c9924-c23d-45b3-a748-6983a151ec53/lujokiduvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9212f893-12ed-4c5e-a3a1-a9d3b97ed5ea/tatomesuvekamid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2fe9b5-c59b-42e8-a71a-2ff3119c3e6d/muliwezigusu.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 5672 bytes
SHA-256: d2e5e3834734738e2e64ded5331305c88e2f0be82a0a7b3a3329941ab8940b5a
font_01_sfnt_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 9660 bytes
SHA-256: 63ae1663e5a9dcb21b494ba8381aed67b0bbc084d0534a11ed5169567fbde916

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