Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfcb1f2681aee4f…

MALICIOUS

PDF

70.5 KB Created: 2021-04-02 09:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5feb87cc09e54abfb523ea85b3741d38 SHA-1: a801857b3e0dd9af5ac2bebd1526fdfc46b76862 SHA-256: 1bfcb1f2681aee4faded4027ad66bc58b1301c22fbce54e614a452d7f27a07e3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation for client execution, potentially via embedded JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/wix?keyword=wyoming+medicaid+ambulance+provider+manual PDF link annotation
    • https://cdn.sqhk.co/valujoper/fTujhgi/doctor_career_pathway_australia.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/zodepemojeloj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5ff79bdedde19.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/easy_touch_home_care.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/sesotidodiwufa.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/5832589579.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/Iijhdge/67728035434.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/96ec49217.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/xunodekanob_jureseb.pdfIn PDF document text
    • https://rawoxoduzipuk.weebly.com/uploads/1/3/2/3/132302868/lapibumaxubi-sotikifu-nerilojaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409799/normal_604b530ba1aa2.pdfIn PDF document text
    • https://cdn.sqhk.co/gejikofoxaf/che0iip/94545178225.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/botany_honours_syllabus_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/ihjaXja/95025423482.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/Tzqigcl/drift_hunters_unblocked_weebly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fc83430138bf.pdfIn PDF document text
    • https://cdn.sqhk.co/musarawaw/cieUFId/92673514710.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/candy_to_word_convertor.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/iCWgHia/luzuwavopebarit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fea1e4c5467f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badamowafe.onlinewebshop.net/2_arabesques_debussy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07263991-105a-4e1c-bb8a-e188383f6456/dutuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e80173-7ec5-47b4-88cc-aeace8d026de/xokeveludaritanerix.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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 5528 bytes
SHA-256: 1e990e10b86c0465f37729549cc2e3c46c39632b53fba05378de91b66cb4f4ed
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10860 bytes
SHA-256: 68a78ac94122b19fc7144fe925d2b5194e9dcf6c740f8df0a397c0d6d35687e8