Malicious PDF — malware analysis report

Static analysis result for SHA-256 3411b2d398493118…

MALICIOUS

PDF

77.5 KB Created: 2021-03-28 11:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bcfb6e5dbb7e49b0cc2300501d6531e1 SHA-1: e41f86b7f9e8da61ff3caa76ef59472997b6cc84 SHA-256: 3411b2d398493118d2a8188870c25b241008e360de0281508e17409bc40eeaa6
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 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

  • 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://ponafet.ru/award?keyword=6th+grade+math+worksheets+pdf+cbse PDF link annotation
    • http://moymagazin.xyz/vowafstih9.pdfIn PDF document text
    • http://bonus332.site/edward_bernays_propaganda_audiobook_frees0cib.pdfIn PDF document text
    • http://igcopyrightverify.com/download_game_sega_pocket_club_manager_mod18rio.pdfIn PDF document text
    • http://fosinofabeveso.22web.org/gst_amendments_for_may_2019_inter.pdfIn PDF document text
    • http://wow50.pro/zepalapmiugh.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/2469737185jzcq7.pdfIn PDF document text
    • http://ladyso.ru/649610661229rdf.pdfIn PDF document text
    • http://junelizirigoroj.iblogger.org/ls2_bluetooth_helmet_manual.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://twoup-viktoria.online/sahih_bukhari_in_urdu_jild_1rt890.pdfIn PDF document text
    • http://pc-remont.website/casio_ctk-7000_manualb05i6.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/4c32b531-06b8-4f0e-8559-4953c58f0cec/how_to_find_the_model_of_my_singer_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0903b0-cab2-432f-b830-07b51d2fe93d/fundamentals_of_physics_halliday_resnick_walker_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0151801-ff93-4189-a96a-62a2049d8830/99314835142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad415b2-0196-4e80-8e1d-bc909aae3cb3/the_road_to_el_dorado_stream_deutsch.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_6a854b1229c44a81a106eeee4c11905e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4695a203-acab-4690-b33d-3ee03d0491d2/taco_shack_jimmy_neutron.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_90c6e94bb24a439ab0a5e7091973b4ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b226e29-4685-467c-bcf9-231cbfd4b13a/80046813099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affd8d8c-79d5-4d82-9cba-d0b15eb5f940/93017114631.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 5892 bytes
SHA-256: 97d01fe81a1e4bebc25f7ec1bba2414cfc2baf3d5c321f82c6635717ae84aee2
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10932 bytes
SHA-256: 144f9e699ec35915dde868c997e9aaa89b5c4c7265dbb08ffc6cde76a3795b9e

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