Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf17edae7d5d86c9…

MALICIOUS

PDF

80.7 KB Created: 2021-02-14 20:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 141136859319cb847102af417e8c7196 SHA-1: e5fa764e4738677ca8aa0ca88a3d06d57ea6eb13 SHA-256: cf17edae7d5d86c94fb778690aaa7c80251487a87fefd667ff31cc0ed2dfb40c
146 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the overall structure and URL distribution indicate a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jacksth.ru/aws?utm_term=arkanoid+vs+space+invaders PDF link annotation
    • https://cdn.sqhk.co/nosuterib/Jic9Fhi/pabujoxuvopa.pdfIn PDF document text
    • http://thiswaytovogue.com/kamuzexuxavepizinya8g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fe97fab29473.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/Phbigjj/sage_the_gemini_best_songs.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/9490667.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/chiSAhg/26221502934.pdfIn PDF document text
    • http://susurrus.space/zexidu1a5t.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/72faef721.pdfIn PDF document text
    • http://medyayazilimtr.com/autodesk_autocad_student_version_free0hnhx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_6007416dbe7a5.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/fudat_nogememato_buvejawu_vowuvagawigater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_600ba98e59f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fe66393b888c.pdfIn PDF document text
    • https://laboxowoxom.weebly.com/uploads/1/3/5/4/135400847/newejakazidinomex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500883/normal_601141e7361ea.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/mokixetat/zinukunaminomatelabumul.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/autocad_2d_building_drawing.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/46013337059.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 4216 bytes
SHA-256: 0bd605d5b10d4e485f59f86954a6a739de19c70a8ec0f211cb8fa371470504d7
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 5148 bytes
SHA-256: adde7607b569cf1ab1c4cf3bd5620ec782413e86c0ea56e581c5b490fa8bd1f3
font_02_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 11612 bytes
SHA-256: 5e2a1df4b13cf693bd7d64609c64c92c0a41626a7e0535dfc775a45b9e158a70

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