Malicious PDF — malware analysis report

Static analysis result for SHA-256 41685756977d8c29…

MALICIOUS

PDF

82.0 KB Created: 2021-06-12 02:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a4bcd1f6ab2e9e58a7ab11af887fba1a SHA-1: 09e49f33f7b21ba6832aa715b7abac184cf8fdf6 SHA-256: 41685756977d8c298e31fab2fb89b11cf1cbff0a15441124c7798a2a3087d830
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 0.9996

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://inwebjor.ru/pbw?utm_term=short+skin+fade+haircuts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385859/normal_60bc35e20e803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_6060afb328d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fc570f99311c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e203634c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jejogitu.pbworks.com/w/file/fetch/144875745/a4ld_transmission_diagram__500____High__99.pdfIn PDF document text
    • http://feselikebapu.pbworks.com/f/73579755354.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/xowasogabofixeselaxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f359a26-02c7-464c-bbb8-75a8a64cb6d9/best_dance_music_70_80_90.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee06c4f-d852-40ec-bb67-3816c0c675d8/exercice_polygones_cm2.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144419103/vagebaxixa.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/kalidonawiparaji.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/idioms_and_phrases_with_meaning_in_marathi.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/81535555654.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/78395682254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6dd8330-e8bf-4873-a9c5-fbf450ac0fa1/a_woman_in_berlin_netflix.pdfIn PDF document text
    • http://mavujorar.pbworks.com/f/grade_12_biology_teachers_guide.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/framaroot_apk_download_for_android_6.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1138004-d298-4f88-873e-d16adfefdef4/black_and_decker_digital_rotisserie_convection_oven_canadian_tire.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/madden_08_xbox_360_download.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/bixalupexarufaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81d8fcd-5db9-4626-8282-d1cfae9bfbe5/lenolaneb.pdfIn PDF document text
    • http://sikovifif.pbworks.com/f/skanda_sashti_kavacham_in_malayalam.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_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 5244 bytes
SHA-256: 01a772e0ec15a882b809027ee297ff2d2dc9c9471e3f51ed07572f6b240ad9d7
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 11196 bytes
SHA-256: 28f2fc98baa04602e49ca324c4309bb89fd3206008c719fa140590a4d3612ff4

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