Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e3f47de77725c0…

MALICIOUS

PDF

81.1 KB Created: 2021-04-01 17:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: be5dca8cc4c6229874dedc80fae9b0df SHA-1: 3094c40bfbd7b6aa23c516368729447c17436da6 SHA-256: 13e3f47de77725c0616c97d0cdd6a58a2df9208da109e2e73a799fda8443764f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/123?utm_term=ananda+marga+books+pdf PDF link annotation
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/wapoxibofegar.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/2576857.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/laworapanalilamoxe.pdfIn PDF document text
    • http://visionnew.xyz/pivenepufogojexupefidazzurbe.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/tudix_lapuvalu.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/2203617033amlsf.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/dusupew.pdfIn PDF document text
    • http://efarbok.xyz/puppet_pals_2_android_apkjs2sa.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/d090e8d9.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/voice_training_course.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/berejumezurubotenumifas.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/5e0e3.pdfIn PDF document text
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/4891596.pdfIn PDF document text
    • https://gasilarax.weebly.com/uploads/1/3/4/5/134595303/muvexumidowuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/2020_and_2020_broward_school_calendar.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_01135e59c77142d595d4f813793b7ff3.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_ba8e9d0101574418b43ee5739e02764e.pdf?index=trueIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_073a618dbb0e4335ae6c77cb971fdb6d.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_43f4535a1c6740238560e167c48cc624.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_ea3c10f6b87b4ff7a7465211ec733d64.pdf?index=trueIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_c74e7bcc624c416290aa3b093ccf9f2d.pdf?index=trueIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_44a764b2eed4421abe8314cb90167afd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 5524 bytes
SHA-256: 5980d4a6357624da2dbc808816396983b18cc7347d68be807ff8d45394ffbfc4
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 11356 bytes
SHA-256: 9125cc96a1627efed275c878869dcb100ad07ef71d4472ced38d792ada52cba8