Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9193d43b1b64b32…

MALICIOUS

PDF

78.7 KB Created: 2021-05-09 22:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 72f384e73e4a21a98ea37c30b5b9970c SHA-1: bbbc076b43152b6e12bc5606045f567b984a0596 SHA-256: d9193d43b1b64b32f12685c94b9ee4f7841aff93d9bda9ee73168d95f2d387d5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, indicative of a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, suggesting it was generated programmatically to appear as a search result or document summary, likely to entice clicks to malicious URLs.

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 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://seumenha.ru/strik?utm_term=50+shades+of+grey+memorable+quotes PDF link annotation
    • https://cdn.sqhk.co/pipezifiwip/hiVW7ok/42073834350.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/approaches_and_methods_in_language_teaching_jack_richards.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/gjnfaai/nuluverowos.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/bofasoregave.pdfIn PDF document text
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/tesonukeji.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/35078.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/TEHjgG0/gukemadif.pdfIn PDF document text
    • http://pakaxofuj.sportsontheweb.net/nesek.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/76868112445.pdfIn PDF document text
    • https://cdn.sqhk.co/belebudetub/ibgfggt/33948633063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_4cc19ee61ad942549cef321f162085eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapelu/pokipifabitoselu.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/let_me_go_lyrics_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/casanova_malayalam_movie_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/taxidozuzumapomarozaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/algebra_de_baldor_google_drive.pdfIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_39b5892c08fe47b39003281f4dead609.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/47965441261.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_9dee26f96c9c4f4098c687a671d6023d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/movie_based_on_tibetan_book_of_the_dead.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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5588 bytes
SHA-256: dbef5e2720778e5296710a67380a3458c36fd639c18a2222266adc0c40515955
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10976 bytes
SHA-256: e7760042f55a49bb62cce7b2087e844a3f2c0792ea4d680ff48df0e251800280
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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