Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fa571e6e16bb92…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 10:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c6fcbeee708e21f7572014516e5f080d SHA-1: e4d829ecb9e73b5089009dd704c116b16097ada5 SHA-256: b3fa571e6e16bb92ba422b264334d970a240d94666e1bef503ae3cd8ebf30031
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, many of which point to disposable hosting or suspicious domains. Heuristics indicate it's a link farm and has been flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=building+design+and+civil+engineering+drawing+pdf PDF link annotation
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/5852698.pdfIn PDF document text
    • http://poopo.ru/453712223094maku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_60248e322cc4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_60070df86ef57.pdfIn PDF document text
    • https://bejokuwawij.weebly.com/uploads/1/3/4/6/134688199/5286726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_602440161f495.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ia5EMsj/lebara_mobile_internet_code.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/gNjiZoY/dupumalegajumupuxemalo.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/29043c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_6036c810c8159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fd63c36bb15b.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/kotekubotojagewaf.pdfIn PDF document text
    • http://pelistens.xyz/how_to_find_providers_that_accept_medicaidydpc0.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/f5b3d32c-7654-4a22-baeb-d9b98362af86/good_night_gorilla_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f11339-f0f8-4d65-8def-04526eb96655/meweko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3d1c2e-dcb3-4863-9ede-bd22ccaa86e8/53393353149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19863210-1238-472e-ae4d-3e6e2d0d2fa4/nakamichi_bluetooth_speaker_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e3f723-2eae-4f8e-8919-df3fb76043d0/sosegovububodad.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_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 5524 bytes
SHA-256: 33e4b9e0ecfcb7d4abbf2dc15f068b18cae350a4f8131661a03b31be9c4c992c
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 10328 bytes
SHA-256: 649342e22c2a2c55a4146070cf0750b5358ff05da9f9a4163bcfb6f0b46bdf8d

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