Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c210c0023c5498…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 07:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7fc1da72658098c2f4ac2ea15086ec56 SHA-1: 4ad60a295e30ec0aef885ccfb75e0867a97931c2 SHA-256: c2c210c0023c5498c0574bbfa5a51439ace537075c4fc1552db4bae5e997cf2b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=corpus+juris+secundum+volume+7+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455403/normal_601f0e92d5aba.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/coordinate_bond.pdfIn PDF document text
    • http://arm-watch1.club/4723300868759dov.pdfIn PDF document text
    • http://lozhobelir.space/vancouver_cost_of_living_world_rankingw1fvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_6020a8dd11bb0.pdfIn PDF document text
    • http://zoo-taxi.site/crown_cdi_1000_no_powerzsps0.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/why_isnt_my_furnace_lighting.pdfIn PDF document text
    • http://1xbets-reg.site/armstrong_furnace_model_a96us2v070b12shalti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_5fd68bcacef5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_a24ed6aaf83c4ed39c43f3f826c94884.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/ap_stylebook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dde122-f13c-4d7b-97e5-71261950b378/types_of_organizational_culture_handy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99357049-938e-43f0-8449-a80b3775ef8e/unication_pager_programming_software.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/filipino_adolescent_anxiety_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9299cdcb-b361-4b86-b973-56423ef5d09b/assistant_professor_medicine_abbreviation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ded70a-a1d1-461f-a80b-6f9466936eb8/xemazojobapanerivom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef454951-5283-45dc-b6c3-581562c33035/us_history_trivia_questions_and_answers_easy.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/65761288891.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_4b0510de46a046a7ba8782f0d9cd40b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a67667f-517a-4655-8699-400152b355ef/armstrong_air_furnace_manuals.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 5132 bytes
SHA-256: 05855fb815d7d1f8ae060a93d275ee86f5d6692a9843e22bcd90f9878751fa5f
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10800 bytes
SHA-256: 139cf9ae800a520212a692370218a11ed55fa6f676d0e2c2b2f1a2e9cd0d85bc
font_02_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230