Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3584909dc93a7f7…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 00:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f8d0493d2c1616bffb42c670cb5049f6 SHA-1: e1085b269825a76331dc5108ab6ef810aa6091ee SHA-256: a3584909dc93a7f72d8fdfacc7c973cf6439400d10f0c20b9db43497f8b7b3db
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external links, one of which is a phishing lure related to checking voicemail on an NEC office phone. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=how+do+i+check+my+voicemail+on+my+nec+office+phone PDF link annotation
    • http://bamefidev.mygamesonline.org/mesa_boogie_triple_rectifier_headphones.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/57313139223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5d07cb-1a4e-4fc5-9daf-fb7b7af5e24b/84211634736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7f7862-0589-470a-a72b-07ed9c1a8ecd/72174574301.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/71206110151.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_6c83d7419ab240d4876322ff1ff0738c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/333ef43c-d513-4c19-82c3-9be0bc1246fe/dance_music_2000s_hits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b418cc56-e3ba-47ab-be0d-9dae1301e6f2/sitoruwirilap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8f0891-a30f-47c1-9214-9cc6b7676a2e/how_to_clean_a_keurig_single_cup_coffee_maker.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_f0fba5290b014b76873fd783e7c15657.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/sistem_informasi_akuntansi_keuangan_daerah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9970a8-4bc7-4b09-84a2-c13ab6719984/magic_arena_deck_building_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc32a2b5-b15f-4a4c-b513-efb9a01638f1/samsung_bd-j5700_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e854b74-381e-4f78-b43a-300ff7db002d/94100427046.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/16991299108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7537f9ec-bcd3-4dea-bc74-9477ded21ac5/math_textbook_6th_grade_course_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072b6c9-899d-44fd-ae84-6deaa7119c6f/5181743591.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_9dc1f26ed8d6462f995709d739869b0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db02b58d-fa69-4cf7-aae1-039a173d1472/how_to_tell_a_sugar_maple_tree_in_winter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5ba3e2-a8f1-4fea-ae6a-59fb7a7f246f/46995236067.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/lilebesovamula.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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5400 bytes
SHA-256: 458c2e53eb5aaee2a2c633b7fca4cb4bb53609fcf4f56e92d847e8f77b3e3b43
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10800 bytes
SHA-256: b158645c1e05df2f644b3135cb2dfe5df7fa326b97cfff3f786fb17063347f6c

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