Malicious PDF — malware analysis report

Static analysis result for SHA-256 181cbe97732691d6…

MALICIOUS

PDF

64.9 KB Created: 2021-03-30 10:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bd24d946326f02de6a248b08b4c07023 SHA-1: 14ec079be5a0b7780c84cfc058ba9525b736d5a3 SHA-256: 181cbe97732691d65838dac8bca6b875c049671e8e16929706cb4609fc7487df
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'tutorials', aiming to trick users into clicking 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://cdn.sqhk.co/wuxaguzifep/heqgfgd/dinotanazipotavexafukapad.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_5fdf7bbcb6223.pdfIn PDF document text
    • https://cdn.sqhk.co/gagupibi/giijgia/snake_oil_salesman_synonym.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/ariana_grande_almost_is_never_enough_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_6013d81a6fa39.pdfIn PDF document text
    • http://disozire.mygamesonline.org/yasin_sharif_reading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_601429387803e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5feece5c8da92.pdfIn PDF document text
    • http://wusator.mygamesonline.org/bibudeveriz.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Eiagmca/daniel_tiger_gay_parents.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/28718491325.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=bluebeam%20extreme%202018%20tutorialsPDF link annotation
    • https://s3.amazonaws.com/gewisetug/hedwig_s_theme_sheet_music_harp.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/why_should_chocolate_milk_be_banned.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/nijenimaguke.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/3m_471_tape.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/daily_oral_language_3rd_grade.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/aligner_orthodontics.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/free_bootstrap_ecommerce_html_templates.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_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 5608 bytes
SHA-256: 7c9377c619c93f660aafb563bbc9909c052996871e0b64a885b6f42231a6ec95
font_01_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 9072 bytes
SHA-256: 4bbeb99be68b2d66e6faa794a38229f369bc3f4ab6af6361a1ea8980924310cb

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