Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f9d7900cb6973e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 08:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6776042c0299867d73e0bf27552852d8 SHA-1: 26921c5a827a5cc833b4b81c28a5fc19a002fcda SHA-256: e6f9d7900cb6973e00a97c097e5e9b50f8c7b2f3a663459a2248f479d3c23b27
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to software downloads, reinforcing the lure. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=brachiaria+brizantha+mg4+pdf PDF link annotation
    • https://cdn.sqhk.co/pemazekefise/hbgjKhf/metronome_beats_mod_apk.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/sefugojevixegazuxofiwexo.pdfIn PDF document text
    • https://lodovape.weebly.com/uploads/1/3/5/3/135350971/kufibubise.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/13160435329.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/hjhfggt/dress_shirt_mockup_psd_free.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/2866041.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/daxifilipame.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/algae_identification_lab_guide.pdfIn PDF document text
    • http://desokore.medianewsonline.com/fuxaxogijolutejexan.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/dusubonifu/corrugated_sheet_supplier_in_mumbai.pdfIn PDF document text
    • http://livodubudo.rf.gd/99702036112.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/12166933293.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/360_total_security_antivirus_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/39678467032.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_df1bc91421ce4a1987bbc8127e827f2a.pdf?index=trueIn PDF document text
    • http://gototura.myartsonline.com/jikikidixojono.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_fb2e39b4050c4a5cb85915e0551f51ae.pdf?index=trueIn 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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 5688 bytes
SHA-256: 397dc464a9a5a37e2973dcec4b055be6f0f6f795ddb8c4d235f2e9074d133dc2
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 13272 bytes
SHA-256: 141b2e4ddaaa1a9e35e79cb10e010f66ad2ca9c2b91a149a3afd9689d3d43ffb

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