Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a15dd3d0bea5a7…

MALICIOUS

PDF

78.3 KB Created: 2021-02-27 19:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0effbdf2f1b1cc555ddb9efdf8d27281 SHA-1: 28a4241bf8b5327dd6af16ad30d8255d17dd8dd9 SHA-256: 39a15dd3d0bea5a7f062ac48c6c8d93d10b432f250b73b71186dc60db46b2511
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic indicate a strong likelihood of phishing or malware distribution.

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://jacksth.ru/strik?utm_term=how+to+assemble+rose+petal+cottage PDF link annotation
    • https://cdn.sqhk.co/jesotipo/e03koKb/waze_apple_watch.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/1000_and_1_nights_summary.pdfIn PDF document text
    • http://ndfnasg.xyz/rt_news_live_stream_youtuben2bh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459341/normal_5fffb910ad1a0.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/ge_low_profile_over_the_range_microwave_white.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/vbGgijh/nobeguxebuvogofepod.pdfIn PDF document text
    • http://varietystore.website/rotmg_trade_serverczvff.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/ibij39c/88845885986.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/how_long_for_ribs_in_electric_smoker.pdfIn PDF document text
    • http://ca-management.website/ai_hide_and_seek_game_downloadvbmhk.pdfIn PDF document text
    • https://cdn.sqhk.co/ganinidunop/lhg8iiT/auto_diagnostic_elm327_obd2.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/eAaIBhi/87956215303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5ff6bf9222d20.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/wchdjiZ/57619225387.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/ihdieig/vojejuwuvupugesirodulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_600a0bf87632c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_600ecce305c29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizodipe.myartsonline.com/dell_latitude_e7450_battery_price_in_india.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/zifudubojufowerewofaxuj.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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5448 bytes
SHA-256: c8249255cb7d528251461e6cc7323debf45f8edb1b934a3960da3c91d47f4276
font_01_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 11136 bytes
SHA-256: 8e1c78b841effddf6fb24bcf13161398b21ad3f3a9a628b6d6fe18e742f9d2e1

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