Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7b92fb1c2f4f68…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 03:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c1952f5a3bd74ad15a7d3ae7a7814b81 SHA-1: 74aed0d18a70fa520256061cb58527ad7e2fe8c0 SHA-256: dc7b92fb1c2f4f68bd49f413f371234dd16497081a038d1541f3d3c553807a63
126 Risk Score

Malware Insights

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

The PDF file was detected 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 and are structured as link farms, suggesting a phishing or malware distribution campaign. The document body, though partially corrupted, contains keywords related to popular media, likely used as a lure to encourage user interaction with the malicious links.

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://druttle.ru/wix?keyword=watch+the+hunger+games+mockingjay+2+online+free PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/smREhhB/amazon_echo_dot_4th_generation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fd88498e21e3.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/bWgOhjQ/video_editor_for_youtube_app_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5ff4371880259.pdfIn PDF document text
    • http://thesimplycompleteseries.com/39038037214yxvl0.pdfIn PDF document text
    • http://agent-spv.space/best_cars_to_buy_dirt_rally_2._0wxsh1.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/why_does_my_samsung_tablet_keep_powering_off.pdfIn PDF document text
    • http://aycotoro6.xyz/my_left_foot_book7dzf3.pdfIn PDF document text
    • http://bighome.space/fake_geico_insurance_card_templateg490o.pdfIn PDF document text
    • http://copyrighthelpcentral.com/how_to_invest_in_share_market_for_beginners2s4z2.pdfIn PDF document text
    • https://cdn.sqhk.co/migiwepi/ehfjegh/bizafowapogekonufibokolud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fcc54be58282.pdfIn PDF document text
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/bbc3fb1f2.pdfIn PDF document text
    • http://retamos.mygamesonline.org/trombone_position_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/icjizYD/zexawuzevosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5feb6000f2f3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/66080575342.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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 5680 bytes
SHA-256: 4e2d6b6f9d6e153b48c45290955919b5c05da886287a84dad5afe8731a12da3b
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 10288 bytes
SHA-256: bd50a6ff59fd014ca5fd9be5b4c1a919f978bd20b8f362463a300b43844efada

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