Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b1d86c9ad65b67…

MALICIOUS

PDF

91.6 KB Created: 2021-05-26 05:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dc5a01aad2eca874b9c0fcb9bba9e9db SHA-1: 7d663c520d70e478e8d75bfaad63ce4ff641708b SHA-256: 72b1d86c9ad65b67946be74e5ae2242fab5ae379aac9468d06823a3c65818a79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The primary URL, 'https://zajinet.ru/strik?utm_term=speech+about+covid-19+pandemic+for+students', is likely used to redirect users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/strik?utm_term=speech+about+covid-19+pandemic+for+students PDF link annotation
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/manog.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/fisufaxaxobi.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/9732837.pdfIn PDF document text
    • https://fuzobiwi.weebly.com/uploads/1/3/4/7/134717163/xapolovus.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/ramogep-ruvowi-suzibarivi-robojewapumux.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/sararaguropofi-nipujisa-janoki.pdfIn PDF document text
    • https://lumekagaxegi.weebly.com/uploads/1/3/2/7/132712489/katusomunu.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/najemudafogixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414868/normal_5fd8291fa08d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6034526e1af37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5ffde17bc6563.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/mijakisogofegojib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_606c9984b8965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/remufuzu/moxebatikomelenugenaga.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/19053454548.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/pilujano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98791631-7ad1-4535-a2d8-719bed1b19fb/how_many_american_states_can_you_name_buzzfeed.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/60589571125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04c8043-9e2e-4ffd-ad97-5bbeb104ccd0/titanic_notas_flauta_dulce_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40779757-7d04-4d1c-828c-833ce574ed98/54996499318.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/how_are_short_term_stock_trades_taxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d75522-10ba-47fd-b0d7-e41d3a81b44e/learn_to_draw_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61303eee-7a4a-446c-ab5e-6499232b70e8/kasogojazetekituzer.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 5788 bytes
SHA-256: f86035e17faa4d58ce0fa08fab471e55881b4208dfc2bb1527fecd64caea6470
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 6148 bytes
SHA-256: 0b8363bc9e07cf89205331d27bc1c31e4fc91592bb846ce71245372e642e4983
font_02_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 11212 bytes
SHA-256: 7e836b8c38189a09a7508e1059276ad8967591ed444e5245747a5bf4132e642d
font_03_sfnt_off000151e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c