Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09d494dceeee5a2…

MALICIOUS

PDF

65.9 KB Created: 2021-02-21 05:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3196c9128db7a8183d11e1d65291fd8e SHA-1: f84b13133417061018d58cd52a5f8fcdfe17ccea SHA-256: f09d494dceeee5a2a91a6d3eb85a2e1d27d3a6891468c1ba86b5c156fa43b13d
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

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://seumenha.ru/aws?utm_term=what%2527s+the+magnitude+of+the+centripetal+force PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fcb6ee5d560b.pdfIn PDF document text
    • http://trokot-newshop.online/konuwovexaxilupiwowj3hy1.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gidmgge/winivoguririlafisifipoba.pdfIn PDF document text
    • http://badgesverified.com/uefa_champions_league_final_2020_time_tvwxn5l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5fc5fc28cecc3.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/eifRVhh/96098886278.pdfIn PDF document text
    • http://dalkomis.website/58976137541o2jwx.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/jjjcSO6/bexoteguledumubelajef.pdfIn PDF document text
    • https://cdn.sqhk.co/jovuvufoxet/9gea26O/veretedu.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/jc2idGr/download_aplikasi_j2me_loader_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/TkzLjeB/sedudurefuvedobapuzenefej.pdfIn PDF document text
    • http://vinorama.fun/pixel_pirates_apkcy4a3.pdfIn PDF document text
    • http://lovelyhouse.online/785165885613bjps.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/dhfhchj/best_call_of_duty_game_for_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/i5DOggE/digicel_play_multiscreen_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/PhgayYW/ashampoo_droid_optimizer_review.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/povelenavuviw/add_text_to_existing_using_python.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/76912886852.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 5616 bytes
SHA-256: f27ef731a9d9dc97076f935699b191bc89c5ab12617b576a893f69c46918bcb9
font_01_sfnt_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 9672 bytes
SHA-256: fd91c50c75fbe334be6711c23f55207937389147f147c45109f86df6a12dc11d

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