Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb64f37f675f5c9…

MALICIOUS

PDF

70.4 KB Created: 2021-03-31 04:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ce73b39cfc56fb1f565e9bb78aa44c7a SHA-1: ee5da6e3f3db1e8e3b06a12b747cad0c6b06102a SHA-256: 7cb64f37f675f5c9f4213aee7f51d524dbafe30108a3224b1020f17ef2d5f298
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the document's metadata, which mentions 'adobe pdf reader java app', further support the lure of a fake update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/award?keyword=adobe+pdf+reader+java+app PDF link annotation
    • http://pugorot.mygamesonline.org/attestation_de_formation_informatique.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/tefenajugerefefe.pdfIn PDF document text
    • http://dinusedixiwog.iblogger.org/vipolupegojosujekolikon.pdfIn PDF document text
    • http://zizopeja.22web.org/garefaroreveti.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/ritenasedazisube.pdfIn PDF document text
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/refafomuxovu_joxikozitaza_befokaxedelot_sewunupeka.pdfIn PDF document text
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/jowujoneni-pawujixuzeziwa-bapedovat.pdfIn PDF document text
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/6716814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478146/normal_6053a035b844b.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/hallelujah_nuty_chomikuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5ff044ef3f17f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_6039a412cc9dd.pdfIn PDF document text
    • http://nowemuzasam.22web.org/karazoxonaworolozejaligik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvekalufisu.atwebpages.com/81812250415.pdfIn PDF document text
    • http://lupinofukebov.epizy.com/45172769036.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_b0e2a2dc4ab4431a8fcf141d89dcd24f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b489f258-629e-4671-ab1e-4a260a6f1601/conversations_in_american_literature_answers.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_47b126123ad240b8a595c7c4e171e1dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9766718e-31f1-4380-9dce-04bc41f0bf5c/possessive_adjectives_spanish_worksheet_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01345310-5aeb-4d03-8c3e-ed87d0028177/ford_ranger_2.2_towing_capacity_2014.pdfIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_03d2989be54843a5b0a914987da640ee.pdf?index=trueIn PDF document text
    • http://vanepozimor.rf.gd/lirewafob.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5092 bytes
SHA-256: 6837f591b5c6b23a2d5198630380f77dd840f83915472a1b29adb1b0ebcf43b6
font_01_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 10868 bytes
SHA-256: 945389a3286ee3fd9808352bff8d479369d00f0675e128c675c4973e6a81f527