Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c4c0ad1bf2ba8b…

MALICIOUS

PDF

73.8 KB Created: 2021-05-09 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e8517c3cd20faa0288c3d006f475b912 SHA-1: 272cc871c95ad24503ee5db43520b9c522e938ac SHA-256: e6c4c0ad1bf2ba8b509f1ca97113bd6b31d71d58d0b9b88963901eab1324d206
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links, 'https://resalured.ru/strik?utm_term=how+to+get+six+sigma+green+belt+certification+free', suggests a lure related to certification. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=how+to+get+six+sigma+green+belt+certification+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369935/normal_60208b38c0f89.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/buku_agama_islam_kelas_10_kurikulum_2020_revisi.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/muraju.pdfIn PDF document text
    • https://lafatizurekasat.weebly.com/uploads/1/3/4/7/134748402/rapasipokor-wagegekimowilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_605470ad0cd50.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/zogaxulobe.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/822060bd-2593-4045-9525-8018c3fcf45c/war_of_the_worlds_movie_alien_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/how_to_reset_golf_buddy_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/mackie_1604_vlz_pro_repair.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/teacher_centred_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44685bde-d9f2-4a31-86de-1fb3d7339f29/58017442315.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/jojorumesozedapotekimaxe.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_242e3ef4d4b44872a878bcb1bcbe8e01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/adidas_yeezy_700_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac7074d-3f54-4c8c-bca9-2167a20b9ec6/remington_pg6025_manual.pdfIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_e080e0beb9b047388f7c5be0bdbb91bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe3db17-2954-4e71-87f9-ca31576f5540/phonics_spelling_practice_book_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a0f067-3e63-475a-8c81-b394bc3db073/the_big_short_real_characters_net_worth.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_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 5460 bytes
SHA-256: 106ccbf8e99e03e9dc9bf196ac869aa728b84a1e76747185bdb2bb6dbe216fb3
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 10396 bytes
SHA-256: db5716492cbc7a567f3de7b1a656949a7614692c48760cf3bd842510e0414298

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