Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff277561011232d8…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 09:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 811e0f5396e77bd220bbd852021fcfc6 SHA-1: 236b1283e1f7c8d81d7c8a658d8c7b999258a9a6 SHA-256: ff277561011232d8db3e388d94e312c7f4a7a39fae0785df37e4992bff15c1f0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=how+to+fix+corrupted+data+on+ps4+minecraft PDF link annotation
    • http://myfoxing.online/69332092129p04hz.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/buwazoba-dulupamiduze-zunaxizonuto.pdfIn PDF document text
    • http://xilagima.66ghz.com/fakorexumasisiborizixo.pdfIn PDF document text
    • https://nenubijul.weebly.com/uploads/1/3/5/3/135393623/83ee7421e28.pdfIn PDF document text
    • http://tixshopclub.space/xapeguwawfwnul.pdfIn PDF document text
    • http://davavemoj.66ghz.com/doctor_of_philosophy_in_education_online.pdfIn PDF document text
    • http://mmmmmme.space/minecraft_skin_editor_onlinepsn2r.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/5903daef-8f2b-4895-a0ec-17b3a8a5bd81/3687942226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a22a8c-9888-410a-b923-dd2a87ca29fd/kiwoje.pdfIn PDF document text
    • http://nujomunoza.rf.gd/how_to_find_the_period_in_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77698475-04b4-4bf2-9ad5-85616828793d/95463546144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7be8f42-432c-4fb1-9545-9e0ccbd09b6c/61020074255.pdfIn PDF document text
    • http://mukaxasapezaw.rf.gd/49250893931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9f2486-d051-4608-b1b6-4ed890f935af/dagavegowopuzogiliji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8980995-989e-4b06-8a13-0b6d1b9e4cd7/pelizugoror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbeb960-4e58-4547-81bb-ed5b03bdfbf4/2488462096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b3ec93-4646-4bcd-8c01-bc5668b1c7ca/breakfast_at_tiffanys_restaurant_portage_mi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b8dd70-68d4-42f2-b7ff-d77680593cfb/ejemplos_de_hoja_de_vida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d2585e-8113-4655-accb-25bbf1a32d8e/what_fruits_are_low_fodmap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c4589c3-2270-45c0-a38d-9c77dd8e1a30/fonekufiwum.pdfIn PDF document text
    • http://gejevebo.epizy.com/present_continuous_future_arrangements_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bac672-32a0-48e3-8f8e-2c79dd513e89/health_and_safety_policy_for_construction_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515b0dc6-c006-41b8-b0d6-5c6772ac4bd1/d-link_dir-605l_as_bridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b751dd-2bdd-42d2-b9a3-c650d8a722d2/vokelexi.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 5476 bytes
SHA-256: 3132acefe958c29866968e5f126b8bc41b76882e75aa6400bec9b06a4a0bbd77
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10496 bytes
SHA-256: 3e6fe2f96441d45ad3067b3a146747f5d260ef0cd83fd445d0899c8afe88d5cd

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