Malicious PDF — malware analysis report

Static analysis result for SHA-256 72859e6e25bf94fb…

MALICIOUS

PDF

81.3 KB Created: 2021-04-11 19:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1d7eb40ab26cf8950b92b918fddeae1a SHA-1: 211d6ba69080f449b9fe04241a28a05a7548e3a9 SHA-256: 72859e6e25bf94fbfe3eb11a1978cf38a2f28e11d286e1ba5cdef8de34c5e90a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or scam operation. The ML classifier and ClamAV detection confirm malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate the document is designed to redirect users to potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=fagor+rapida+pressure+cooker+replacement+parts PDF link annotation
    • http://lnstagram-helping-centre.com/3687077486767py0.pdfIn PDF document text
    • http://bebenomilu.22web.org/jee_b._arch_question_paper_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6016dfa03801a.pdfIn PDF document text
    • http://prostotit.site/examiner_report_igcse_physicsarumh.pdfIn PDF document text
    • http://topcabinets.xyz/what_lancing_device_works_with_one_touch_ultra_soft_lancetsi3sqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd132474f12f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_601600469e1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_6012ca28818e6.pdfIn PDF document text
    • http://bloodcraft.online/ohio_state_football_schedule_20202yqos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fc7ef6a5d7d2.pdfIn PDF document text
    • http://keto-s1.com/lowes_food_application_formryn2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fdffae685807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_606d5c80e73ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_606e33ee4565b.pdfIn PDF document text
    • http://tivunuvuzamiguj.22web.org/definition_of_literature_review_by_famous_authors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_7210d68338974b28932ab54f73d6b8ba.pdf?index=trueIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_2a79b248083041c2a533f52fda42887e.pdf?index=trueIn PDF document text
    • http://zewedazogiwake.rf.gd/genetics_vocabulary_matching_worksheet_answer_key.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_efc0c80606d4402bb6bfb6e59d01a75f.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_14568c40ec99428283a1504d01c3961c.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_9cee785aff964270a323ec5379d9050f.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_199e856326814ce59cd29ca12a9f6cf5.pdf?index=trueIn PDF document text
    • http://nakepusejedub.epizy.com/42087197985.pdfIn PDF document text
    • http://lakovejaduga.rf.gd/22194014016.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_d771112022204241824415677ef395ce.pdf?index=trueIn 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_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 5412 bytes
SHA-256: 5263e23a4173468f5683f471afb69ab34c3d099d804533ce86dc8ad7cf489b98
font_01_sfnt_off00011251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 11064 bytes
SHA-256: e4a0c11b4fd1ea39ffe5b651b1fa4cf019541a209bbb38fa62b0f7f14d8c157c