Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ebb0c183245c8b…

MALICIOUS

PDF

71.0 KB Created: 2021-06-14 04:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da3166532dd406dc854b3498d7b8947f SHA-1: c9d35824c0d82a6358503f8adb4e541639137193 SHA-256: c0ebb0c183245c8b433d8303cfe348617e2b9c2e966804470613b4720d661726
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to link farms on disposable hosting, suggests a phishing or credential harvesting attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into navigating to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/pbw?utm_term=complex+analysis+by+dennis+g+zill+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390366/normal_60b7b7ce55b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_604a62322de1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd69ebd3347d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibokuwogi.pbworks.com/f/50461244009.pdfIn PDF document text
    • http://guvevef.pbworks.com/w/file/fetch/144745095/13904825786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fc818e-c5f2-4775-a00b-c80e598518d5/15442056405.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/dugosagolobeveboku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16ac358-f66f-4123-9702-e05610f4ca81/love_dare_from_fireproof_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b710a248-a37c-44ba-b5c7-f752ef356b18/who_died_in_13_reasons_why_jeff_atkins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ca185f-5380-4240-a572-6688af76e684/four_basic_data_types_in_c_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a3079d-03e9-484c-a16a-609361d359c1/24824991139.pdfIn PDF document text
    • http://xizalow.pbworks.com/w/file/fetch/145168545/zalatawogefudunijunigena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3d156e-dc91-4408-8ebe-fd4660209c40/how_to_charge_36_volt_battery_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a768d98-bd0c-406b-bfb3-6c663d61fedc/25517625034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03de7056-e0a2-4158-bc2f-dd4de1d90f85/dnd_5e_warlock_spell_slots_explained.pdfIn PDF document text
    • http://jawegele.pbworks.com/w/file/fetch/145204911/after_we_collided_free_online_full_movie.pdfIn PDF document text
    • http://feselikebapu.pbworks.com/f/72703394281.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/76429074246.pdfIn PDF document text
    • http://takenerexa.pbworks.com/f/famudevodaxud.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_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 5448 bytes
SHA-256: 793ab022d7484fe1d4fee9247601d0fa9fba3a5d5b3401d15a1dd9815028a354
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 11064 bytes
SHA-256: 7fb4c82e38624baaabb92ee11699dbb148f618a0c3fa8c7d90a24b0f21d68fbf

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