Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f11741938351c6f…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 02:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ab38931a3a7c07bfb51b1a2827a576d SHA-1: 459b20f422733daed81824f5f89eb98c2c242561 SHA-256: 9f11741938351c6f7ac9675c647a673d0cd991fd7856aaaa695b467100391a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ponafet.ru/123?utm_term=lean+canvas+template+ppt+download PDF link annotation
    • https://cdn.sqhk.co/bunigenozav/tEjeihh/benudizoredapupez.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/3gi1ja3/word_cross_reference_not_showing_all_headings.pdfIn PDF document text
    • http://ita-yog.space/emergency_treatment_of_hypertension9ejq2.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/Wiaifgh/84519935757.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/hopper_with_sling_model_number.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/MYIgijc/secret_codes_for_blood_moon_tycoon_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/mefomixut/ghd95if/jefikizogokolupamabeg.pdfIn PDF document text
    • http://fakaripeti.xyz/how_to_reset_orbit_sprinkler_system9pn9q.pdfIn PDF document text
    • http://help-nanny.site/titans_cursefphnl.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/57554813918.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/3Ccgtjd/lixumewaw.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/95746917363.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/pBjdzyd/toxivokosiwurubivajaj.pdfIn PDF document text
    • http://hookup755.fun/padi_rescue_diver_course_bookwecch.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/gekojulog/the_secret_book_treasure_hunt_cities.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/kalajijoveb.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/93441657887.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/54848215740.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/trainspotting_book_vs_film_differences.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/ps_form_3602-ez_fillable.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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5216 bytes
SHA-256: c41949615415cdf98397a6d518b2c39a1afedde30a68f4b579ca501ec3488dc2
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10952 bytes
SHA-256: 95697f7dc31b325dc1e678cd08f51f6caa4c357947924efc4977240fb496fe5f