Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a789279fd4129b6…

MALICIOUS

PDF

68.5 KB Created: 2021-04-22 00:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80fa216b39eaecee6b9858cf487d389 SHA-1: 58b9ba5696dbe76e444b5b784e6be53d53582961 SHA-256: 1a789279fd4129b6c66ad67a12b3f9c4da8241d60e68701eddb15f490b3baa58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to 'Ukulele magic book 1', which is likely a lure to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=ukulele+magic+book+1
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://replyua.site/hva_er_epileptiforme_anfall2ilvq.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/jeguge_penipade_fisijep_woguke.pdf
    • http://megalit-korolev.ru/total_landed_cost_excel_templatee7b72.pdf
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/fazirujudefu.pdf
    • https://cdn.sqhk.co/ravusigi/hheXwts/konatinigawutosodafi.pdf
    • https://gikigafe.weebly.com/uploads/1/3/4/4/134440869/4562666a81e01.pdf
    • https://cdn.sqhk.co/noloxunipe/LjeI8gf/wolf_x_reader_lemon_wattpad.pdf
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/mobidipinigiv-bituwid.pdf
    • https://cdn.sqhk.co/sosexazefip/hfWtjeG/nawuromuretefas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorulusof/milafamusid.pdf
    • https://uploads.strikinglycdn.com/files/45c91a7b-a7a9-4193-9ac2-0a35cc525104/how_to_set_up_swann_dvr_for_remote_viewing.pdf
    • https://uploads.strikinglycdn.com/files/d5f90b07-39d5-43ad-9f3d-483e54820a5f/63294297589.pdf
    • https://uploads.strikinglycdn.com/files/943b6d58-0010-4d92-abde-5be86b2ecda7/jezekokasigililajid.pdf
    • https://uploads.strikinglycdn.com/files/550fab12-e88c-4919-ab1a-923701576e8d/.pdf
    • https://uploads.strikinglycdn.com/files/61b8fde9-cdc1-4355-b403-61663c9da49a/49420189392.pdf
    • https://s3.amazonaws.com/tofizo/free_sheet_music_fur_elise_easy.pdf
    • https://uploads.strikinglycdn.com/files/7ff2dd19-fced-4f5d-9661-908e13f03215/cross_country_training_program_for_beginners.pdf
    • https://s3.amazonaws.com/natewared/65163853036.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/roserub.pdf
    • https://uploads.strikinglycdn.com/files/e6c4178a-7f1d-45fa-9ba8-1a1705e30ccb/79560829471.pdf
    • https://uploads.strikinglycdn.com/files/f944e829-700f-447a-b7db-9ef133e5aaaa/best_self_behavioral_health_sweet_home.pdf
    • https://uploads.strikinglycdn.com/files/73761388-d0c1-4149-aadd-796208b06a2e/can_you_get_a_driving_record_online.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd13.bin
1dd6d93ca2e9d6cf191e2da96f39bc116cca5ca0d51571ac3c192835ae48b2c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 5092 bytes
font_01_sfnt_off0000de68.bin
892b9e197736da14d9214db914ccee9cb742d0207055e0f3f51c7b34f42d9554
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 11780 bytes