Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4adff3cbc3157b2…

MALICIOUS

PDF

85.5 KB Created: 2021-01-30 17:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 594ac60e35bc03c00b9929249dd60da1 SHA-1: e47ff5d241628dcfc237672b4276bb3490e83d58 SHA-256: d4adff3cbc3157b2d0b0a2256338b78404b27eab25d8e81fb9b4ff4d7a6c283e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on S3 buckets and Weebly, suggesting a link farm or SEO spamming operation. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'infinite geometric series calculator' and 'wkhtmltopdf', likely a lure to drive traffic to the linked URLs.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=find+the+sum+of+the+infinite+geometric+series+calculator PDF link annotation
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/9578700.pdfIn PDF document text
    • http://fiduvizowema.iblogger.org/www_bcassessment_ca_appeal_form.pdfIn PDF document text
    • https://cdn.sqhk.co/palevisi/32jh1ji/1536462138.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/O1hffhi/packers_bears_predictions_winners_and_whiners.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/Q0jagdX/wordpress_tutorial_free.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/c7749bd3243.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jKjgOia/29194696213.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/P7kjjNV/6322278007.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/eohfge5/wsdot_cameras_bellingham.pdfIn PDF document text
    • https://cdn.sqhk.co/zujagepax/jgojdDK/vagilisozizok.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/gozifep/cameraman_ganga_tho_rambabu_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/uc_browser_offline_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/50225843963.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/paid_android_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/doxisotogo.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/11228479331.pdfIn PDF document text
    • http://wenuwobowikowax.rf.gd/1403154342.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/91492566544.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_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 21512 bytes
SHA-256: 11624082e079bd76589c57a3c18fbee9517a44970ce5a00e6bdb1954b0c6f4a4
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 5392 bytes
SHA-256: 6af2341a0a1e83a652eab4d9efd14c1a5850859327522484966160b0664c3c2d
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 10420 bytes
SHA-256: 473c80cce4b944df3bfb12c00006970f94ada9208ab3941de513f86f8922d95f

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