Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad86470473eb7958…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 09:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07990e5e7c846b7ea0ef67082072b0b6 SHA-1: 113912c3566e43357cf3b8bbfa737c05cae9d49b SHA-256: ad86470473eb7958570de30ce1f0e10c8245dacd50a7469770ac25757029ba46
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity, likely spearphishing via attachment to drive traffic to these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/award?keyword=adjective+sentences+examples+pdf
    • http://xemizawufogutuf.scienceontheweb.net/read_the_adventures_of_sherlock_holmes.pdf
    • https://static.s123-cdn-static.com/uploads/4445743/normal_6007d1eab0367.pdf
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/4032983.pdf
    • http://gisoboxizaza.mygamesonline.org/bojumeworigi.pdf
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/e614bcef8f.pdf
    • https://gaxifuxizuru.weebly.com/uploads/1/3/0/7/130739475/3208084efce9e9.pdf
    • http://pinopizo.sportsontheweb.net/zowapaxonomemidudunu.pdf
    • https://cdn-cms.f-static.net/uploads/4448713/normal_601d369e5ab46.pdf
    • https://cdn-cms.f-static.net/uploads/4405674/normal_601673b0d199a.pdf
    • http://ninomut.sportsontheweb.net/basics_of_computer_and_applications.pdf
    • https://cdn-cms.f-static.net/uploads/4494138/normal_604377f6f2fa8.pdf
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/90e4f9b834f65.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/patilawasu/botaribideramozezivet.pdf
    • http://zujakogi.onlinewebshop.net/disruptive_innovation_definition.pdf
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_2a9c409377d24acf9a5b5359b39daa5c.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_f569ec122d3940e18078147c1ff9b518.pdf?index=true
    • https://s3.amazonaws.com/gavapozalilup/pikukexixa.pdf
    • http://popofisofol.myartsonline.com/how_to_become_a_sports_nutritionist_uk.pdf
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_3e33523d78be4d11aa2b999e79323d7c.pdf?index=true
    • http://naburonip.myartsonline.com/oxymercuration_demercuration_of_alkenes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin
b2a1dba360f4e823cfcec756a0146f6c6b55d6c759420a5b39e5aa56b020341e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5396 bytes
font_01_sfnt_off00010232.bin
bd548918295c4f24e6d1958eac66e2dd9c4909f3f9bb0ad188bc4736fed0b02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10632 bytes

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