Malicious PDF — malware analysis report

Static analysis result for SHA-256 d407672a7c806ec9…

MALICIOUS

PDF

80.1 KB Created: 2021-03-25 10:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 87374d1aeda88e98768fba2cd2090fea SHA-1: 1ebda2c9cd405d5dd9240c2ff4866cd05346f6b5 SHA-256: d407672a7c806ec9192473edda7a760a0f0361615ee68b96833a64630fe49b74
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, commonly used for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=cirrose+hepatica+fisiopatologia+pdf PDF link annotation
    • https://kiloxuloje.weebly.com/uploads/1/3/5/3/135398856/kudari.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/33931716096.pdfIn PDF document text
    • https://nobobigo.weebly.com/uploads/1/3/4/4/134403715/8237592.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/hcKGWii/58993289797.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/rf_power_amplifier_design_tutorial.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/fepeteraverovedenenux.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/Kfieget/bingo_champion_free_offline_bingo_games_play.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/4947596.pdfIn PDF document text
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/9099109.pdfIn PDF document text
    • https://luselovuxetox.weebly.com/uploads/1/3/0/7/130739290/c0ccb5ed06.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/3140175.pdfIn PDF document text
    • https://cdn.sqhk.co/mefivujosawo/xhahdje/medixudob.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/berorebo.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/bojafazes/rose_flower_good_night_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cae524-3969-43b9-b720-fae85c86b536/the_submissive_activity_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/ganifoje.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/wekimiwetofuzad.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/la_familia_de_pascual_duarte_resumen_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b96c54-c3ed-4ddb-9d3f-ae3d61d31541/polaroid_sx-70_teardown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cea49e3-37da-435c-b367-2a2c5c341062/lipegejapizazota.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/ieee_802.15_1_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecaa0db1-84ec-4c5b-a01e-892c5be6cd5a/vugupaleridojod.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_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5320 bytes
SHA-256: c73c08f4c5f9f3e3dc3b08375596fbd6fe845200b97eba787a7c641f9c330068
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 11824 bytes
SHA-256: 198500d6e6778cab788632d54c400e6e14026f15f7fc18db7d8f4ee2073b116a

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