Malicious PDF — malware analysis report

Static analysis result for SHA-256 e840e8f45f0b3c62…

MALICIOUS

PDF

69.1 KB Created: 2021-03-23 23:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 47f0163ba1d09a70a714465e9f97b3e9 SHA-1: 4882b67739bb84b0acaaddde148decc6d026ec85 SHA-256: e840e8f45f0b3c62e563b35dd240d8af1cfc3f86b8ee2a4533e674be56e48715
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=farmall+cub+shop+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/wanolugago/iijc3vm/44974883642.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/hindi_grammar_worksheets_for_class_2.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/present_value_annuity_due_table.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/jijlXji/candy_crush_saga_download_for_pc.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/holt_mcdougal_algebra_1_online_textbook.pdfIn PDF document text
    • https://volafonozus.weebly.com/uploads/1/3/0/7/130775232/vawisidozuwutuwan.pdfIn PDF document text
    • https://winuvepesedop.weebly.com/uploads/1/3/4/4/134476249/3478918.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ifOnibt/hideki_tojo_birth_and_death.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/totiratopafexa_falijax_vovexitevogot.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/data_science_as_a_career_in_india.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/academic_performance_of_university_students.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/99467466718.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_8c55db7ecd854834808466b4c2204f79.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_3a4b1032ce5a4d69b461feca5c171872.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_8cbddae824ef4dcca97a7ef622aec0ff.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/navy_regulations_on_neck_tattoos.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_2209775a7117470089c1b9aa6be82f05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/88205198339.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/ps4_slim_disc_eject_issue.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/fufebuwavasuza.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 5488 bytes
SHA-256: 437317ce476e4354c23534fabffdec9d00332c7ed2315da9c8fdff17153597a5
font_01_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 11164 bytes
SHA-256: 29a9728112bbddeb5a7952a1a12b19454130fe9ca55dfc0eeef68757363df393