Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb811335b1eb1b0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 02:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c54285e3acf39a716adf58b8fd6f8a69 SHA-1: dc8cb0c17fb62346c1521821e56f38c3d9811b83 SHA-256: 4bb811335b1eb1b0f198e53ca580f0e5eebf224a23ab8f48b6ba27e647d9dddb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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 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://lozipotod.ru/award?keyword=article+review+format+pdf PDF link annotation
    • http://kpupnov.pro/73915386766uubvi.pdfIn PDF document text
    • http://instapriz365.online/are_prisons_obsolete_reading_guiden3su3.pdfIn PDF document text
    • http://pro-konditer.com/is_the_canon_t5i_good_for_photographyo5o4l.pdfIn PDF document text
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/e4d115.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/didueJs/39808515574.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/hfjoige/rirofusedakinibomi.pdfIn PDF document text
    • http://instapriz.online/what_size_is_30_in_womens_jeans_uk9uyml.pdfIn PDF document text
    • http://cmb-eco.com/309325008497n54a.pdfIn PDF document text
    • http://myimperfectmomlife.com/miracle_morning_routine_youtube64m3n.pdfIn PDF document text
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/ropopu.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/hjhcQie/game_maker_language_reference.pdfIn PDF document text
    • https://vituxusupodewe.weebly.com/uploads/1/3/1/3/131379836/liwuneberedifat.pdfIn PDF document text
    • http://bottlechainworld.com/kesobuxexabekowo8gbu1.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/4290815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa8fc5c-4e1f-4a94-a201-ab90609ec43b/the_10000_year_explosion_review.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/update_android_tablet_4._0._4.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/where_can_i_buy_corian_countertops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a7c787-3bad-4f17-9c59-8e37664fdaac/subikonowesotak.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/dish_network_hopper_3_installation.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5264 bytes
SHA-256: 469e30d32627ce8d4dcb9ffee8b197f1381cb60dedbe16530c0afe8ee835295b
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 10924 bytes
SHA-256: 80d0549fbe97583cdd8e353dec071e16f66a790c96424b1e0802b04627ae51b3

Open this report in the interactive analyzer, or submit your own file for analysis.