Malicious PDF — malware analysis report

Static analysis result for SHA-256 d121e8a8a2d441fd…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 22:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a9cdfb98491493ec4d435333a3933de3 SHA-1: 1c5b8e076b9806fec55fa2584ebb80f3326c3266 SHA-256: d121e8a8a2d441fd4215ad9b7b1a8080a2e42b92d01a9c72fa9f5772a689358d
186 Risk Score

Malware Insights

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

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 6

  • 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.
  • 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://jottigo.ru/123?utm_term=anglo+saxon+burial+rituals PDF link annotation
    • https://cdn.sqhk.co/doxowite/SVhgnii/cute_cakes_hours.pdfIn PDF document text
    • http://ellmax-site.xyz/spinal_cord_injury_exercise_guidelinese5swn.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/1860317.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/hcJigjg/dibasic_sodium_phosphate_ts.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/movizanosafonajenuju.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ggEjjPi/santa_in_your_living_room_app.pdfIn PDF document text
    • http://vemasujananexu.22web.org/libertango_4_hands_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/dihhjib/megan_rapinoe_book_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jhheL8N/86177822663.pdfIn PDF document text
    • http://899themes-demo.ru/reading_comprehension_exercises_with_answers6k2yb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novezepif.rf.gd/7621496005.pdfIn PDF document text
    • http://fepavipa.epizy.com/rijake.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/deewangi_ajay_devgan_songs_free.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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 5048 bytes
SHA-256: 018a58cdf81cb480506284e8082f9b73a3ca84343f17ec94e9f745147f1a9b5f
font_01_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 9904 bytes
SHA-256: bd5e4655f3e70d0e8fd03fe97687d49a084b337df9eca3510850b5f69790e60d

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