Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6eacfdfbbb5ff3…

MALICIOUS

PDF

78.5 KB Created: 2021-04-17 18:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b1cbb48da3486fe155c546b1f2208a8a SHA-1: 4edad00b816397ac72c63275f58ec5d97903d7db SHA-256: bb6eacfdfbbb5ff3e5443a59344632d7c6c2d8cb1a6dbf77ee23263a7c07245f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, and is flagged by ClamAV as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs is https://nipisod.ru/strik?utm_term=star+wars+jedi+knight+jedi+academy+training+course, which is presented as a training course. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

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://nipisod.ru/strik?utm_term=star+wars+jedi+knight+jedi+academy+training+course PDF link annotation
    • https://puramekekekiz.weebly.com/uploads/1/3/4/6/134648744/56e746.pdfIn PDF document text
    • http://cmb-eco.com/bolidufobosuxusojokaxo9gjtu.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/bunosovanewu_pitaj_senetorewesut_zufozumukaj.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/damuduvexevarotez.pdfIn PDF document text
    • http://bathforlegs.xyz/fuguxowxx10.pdfIn PDF document text
    • http://vkysnaya-eda.site/pikisuwekixjahcb.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/2050470.pdfIn PDF document text
    • http://vladport.ru/basic_electronics_mcqdache.pdfIn PDF document text
    • http://my-favshopg.online/gawazejudulisojitosinewoldhro.pdfIn PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/4101012.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/xozesesigerururosuvoxu.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/6005173.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/8779073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c98953a-742b-404e-8454-56a6b0546711/standard_high_line_bar_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b304ae2a-cae0-404f-bd18-3543a8a8d366/what_was_the_purpose_of_the_4_freedoms_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6591f2-a4e6-41fb-907c-332c69f68b25/what_is_the_meaning_of_desktop_publishing.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_805753dc5e0f4b069831e18e29b98baf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81299a5-ba13-4652-bbc5-265212707f53/82780486179.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/articulos_sobre_el_cancer_de_mama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2a943b-4979-4e50-bd70-7d2346f4cd06/gaduf.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_8289a2ff99be4bd894ad1c41ccebaf8c.pdf?index=trueIn PDF document text
    • http://pevipitoz.atwebpages.com/alla_prima_technique_oil_painting.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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5760 bytes
SHA-256: 6618649755f4d7c5c903c20016b10480c3511cc8b55d564417a58ea04c1aefec
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 10516 bytes
SHA-256: 0bbb4b74bf9d198154e9c22fe0d128fe19d6bc306b029843face5ab582255240