Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1ea3b0a23bbd3…

MALICIOUS

PDF

104.4 KB Created: 2020-11-11 12:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05b47f03c4ab4ab05fda39b6c74287a9 SHA-1: 81278bd362b4b5ce853ed7fa251572dc8924bf41 SHA-256: a9f1ea3b0a23bbd3fe615327ad2fbd3d6cf16564a59f68dc72d58c6f93a8e2a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs extracted is 'https://trafffe.ru/123?keyword=words+for+butterfly+kisses'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure points towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://trafffe.ru/123?keyword=words+for+butterfly+kisses PDF link annotation
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/povof.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/7591158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fa67f6074dfa.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/bewawufamumola_dikewipe_juzozaka.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/sujidumezoxiv-borufajumozaw-dolav-malifok.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rotesojelunemiroto.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/d819ed4.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://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tekujel/billie_eilish_spider_in_mouth.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/behavioral_finance_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/balanza_de_laboratorio.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/23899557204.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/dragon_quest_xi_trial_isle_recommended_level.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/learn_english_through_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/8172383018.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/file_extension_apk_windows.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00015e7a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15E7A 21756 bytes
SHA-256: fcd55a88fca288118cafcf39c21ddce53d3c7766699a60e698ce272829a6fa81
font_00_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 7108 bytes
SHA-256: eb11174bdb2663ca3e2089b61f5165baf99fc61e94e3f563d5fd704739482057
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5012 bytes
SHA-256: 03d0acb594b94a260cb6116a6683296783bc95a91a8c12ccebeef9c577c4e2e5
font_02_sfnt_off0001116a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 6448 bytes
SHA-256: 6e02e4d050bf6ff5f7e2ef7bb6c8da9242bce7031a211f5c0272d22cf815def4
font_03_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 21520 bytes
SHA-256: 8e7b73584fe2c76432a8b0bbc2bd01bc285c8c9ae7a5a59e89a84d8c29b6c052
font_05_sfnt_off000183c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C6 3856 bytes
SHA-256: f07e1a49ab9035751463c4996c6cff607917339603d6e1053767f296ff0685e1

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