Malicious PDF — malware analysis report

Static analysis result for SHA-256 c770bb77473475ad…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 04:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bee3c75209219f1edd1eb4455fa9e488 SHA-1: 21f84045f74b09eab935e8f459f7bf6dd90df801 SHA-256: c770bb77473475add99292444be11648fdc07bd298c3b5dd516340a9072d6e4c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of link farms on disposable hosting.

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://dugedepap.ru/award?keyword=adobe+acrobat+compress+pdf+file+size PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5ff4f96495168.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/hPejEBP/vitamin_shoppe_near_me.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/5163387.pdfIn PDF document text
    • https://bulabameworiw.weebly.com/uploads/1/3/4/0/134096114/lupuvixukini-nuxadum.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/1571356.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/9495402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393647/normal_6041f306a9b3d.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/first_law_of_thermodynamics_worked_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/icgjhaA/naxowu.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/iiagehg/texas_a_m_corpus_christi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_60020ae443cbd.pdfIn PDF document text
    • http://befipekawuzader.iblogger.org/zonowufofowuwerofukupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_604aafb76abe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bememikat.onlinewebshop.net/adjective_or_adverb_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe304602-7948-4d9c-bbee-ae7ef23b51b2/what_do_cherry_blossom_trees_look_like_in_summer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99be9447-79b0-4802-9baa-a4682cf6df03/how_to_community_organize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311d69b4-3a97-47dc-8430-d099d32076eb/do_rational_functions_have_vertical_asymptotes.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_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 5480 bytes
SHA-256: 15e7b1c79ec5bd90ef8b4cb68c9477af1ad9481e5cd3c7808af930d3bfdc2602
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 10328 bytes
SHA-256: 8fe94c270aade3759e0afced82bd46c7ee759ca9bb92b3a47bf7469ce753cf5d

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