Malicious PDF — malware analysis report

Static analysis result for SHA-256 565bc8fb7da0f242…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 21:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81ef103684035cf2f7216471d6f8dde3 SHA-1: 9fe982581b2e192ef407fcaeec99d5bc3aff953c SHA-256: 565bc8fb7da0f2421c5de551de9eae43f4762775ef3c849491801e78edca49d1
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 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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=judy+blume+freckle+juice+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380869/normal_60225a3b1680a.pdfIn PDF document text
    • http://getsalle.xyz/escmid_guidelines_pneumoniar15xf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_60463bd699a6e.pdfIn PDF document text
    • http://tikukef.22web.org/sonulonijula.pdfIn PDF document text
    • http://repair-foto.ru/image_use_agreement_form9r2js.pdfIn PDF document text
    • http://winoorama.fun/geronitwdng.pdfIn PDF document text
    • http://kurs1.xyz/samsung_s9_price_in_dollarsvvxsv.pdfIn PDF document text
    • http://jujaxapuwuravof.iblogger.org/g3_genuine_guide_gear_burnaby.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/tiniruru/godewizamabibiferowi.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/zudazetipuderazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb28e77-30f0-4cc5-aa46-57fc0321e8aa/wawajoreluvoxatore.pdfIn PDF document text
    • http://sesunofopum.epizy.com/asphalt_8_airborne_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26ec84d-fa79-466a-9509-5adecfd79caf/lavobatarotokiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb546503-65cc-4e7b-89a9-e1a66ffd6913/jbl_flip_3_waterproof_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ee79d3-5733-4e13-ab25-c3769a26a50f/direction_of_shear_flow_in_beams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d6fd6e-6676-4fe6-9b03-d0251f06f3ea/digolapusijaniler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f756a0-a4f2-4712-a4fc-f8ec83ae330f/pasekaxozan.pdfIn PDF document text
    • http://setixebasedi.epizy.com/how_to_read_music_on_bass_guitar_-_lesson_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5578a1c4-4a5b-41fd-9276-3ee233ea1b81/40689241708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40f9a8e-27e7-48b4-af3d-abb7886d41fc/zulukivilisima.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/kunuwaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ec0ee8-39e1-475a-b976-b2afd352251f/rakubatirir.pdfIn PDF document text
    • http://bilunijo.epizy.com/aggregate_shape_test_lab_report.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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 5540 bytes
SHA-256: db7e0ff03359475e20eaa96921b6ade9a5ca6eff019fb65e862bcc012524a343
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10512 bytes
SHA-256: a8a99af9c0907fff751893c4a5be8f8e50784f372d4efbeb8cb0e3b2f2fbe0d1

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