Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfcb87d24c0c0ea…

MALICIOUS

PDF

85.9 KB Created: 2021-04-05 22:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6c8848d53a678e32af274edbfcd55753 SHA-1: d39b7f172c834c72f04d31b9c5bb8085d94f1009 SHA-256: 6bfcb87d24c0c0ead1637fa858e63a19aeaa2937a61c12319dfd931fd3b28e5e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links suggests an intent to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=math+nation+section+4+topic+1+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389085/normal_5ff76f925f50b.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/f0a7f5.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/arthur_schopenhauer_biografia.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/jokikanumuwi.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/juvizidoboxaga-xirepupi-xegut-kanuxipoma.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/venenexig.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/didezi_kiforus_juvimiragakobeg_gogejokoxar.pdfIn PDF document text
    • https://mofegagopabelem.weebly.com/uploads/1/3/1/4/131438130/jimewepop_davizogopogax_zateb_barez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fc756209994b.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/ddf9efb0f35a82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fe38257ab80f.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/fetobilegidi-kudomaveladetu-sodurije-kudatabite.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/entry_level_software_developer_jobs_miami.pdfIn PDF document text
    • https://wupumemugate.weebly.com/uploads/1/3/1/4/131407036/kupabagafozozi_vikojuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5f584d05-92f4-4af9-a9bc-38ad626c1b06/python_tutorial_for_socket_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf29356-b702-4df4-b069-97fc442d2665/67705982057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56d88f4-6b10-4987-b03d-ae6e867ba192/how_to_calculate_drugs_in_nursing.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_c8a43bf435464f1c928e66be0a2c0a5a.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_cbe1c57ec0b14b50bbb4eb7837695ddb.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 5012 bytes
SHA-256: feb9f6730b4a3de94d11ff305a3c714be13da49b356cce9aaf581c7d7114e584
font_01_sfnt_off00010c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 11000 bytes
SHA-256: ecfcb60995d2cf89de4a0fc4a397f1c1e8528dbe738c76d8cbced22f5acbce0d
font_03_sfnt_off00013a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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