Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9b73cd764910c3…

MALICIOUS

PDF

91.2 KB Created: 2021-02-11 17:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82a0e9516c8fb430effcfc9718fc303f SHA-1: 817fdbb1de5bb3db59d4341fc4c5a36dc5194ef6 SHA-256: 5e9b73cd764910c3fd614b6859e5800467a0e84697b05ad50cbc6c1d0ae36e9a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') that is likely used to host malicious content or redirect users. The PDF structure and embedded links suggest it's designed to trick users into visiting external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://jacksth.ru/wix?keyword=rosario+de+la+virgen+de+fatima+meditado PDF link annotation
    • https://nalodewemutut.weebly.com/uploads/1/3/1/1/131164475/4546308.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/busifibozadutuzote.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/dhghagf/video_poker_slot_machines_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_601cb383aae58.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/5250934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fefcdcff2d42.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/TUwbumA/56761393548.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/4753808.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/3943059.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/528d24b3e21.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/nerogile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_60247ea22bf1c.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/iidifzK/gesopanig.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/el7hfHB/weed_killer_for_flower_beds_lowes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kupavojos.epizy.com/english_verb_tenses_chart_worksheets.pdfIn PDF document text
    • http://netupizorazez.rf.gd/today_s_love_korean_movie_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/xutonarokezisariraxipuk.pdfIn PDF document text
    • http://bizaludewop.epizy.com/mobiturele.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/guardian_angel_song_let_it_shine.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/wetobutulivifawubuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/rijukekelarolanotopumepa.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/desktop_calendar_free.pdfIn PDF document text
    • http://finuximiwogum.rf.gd/60923059192.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 5080 bytes
SHA-256: ab713bed865af2e659d9cb0482acec8ae5cb7580901b1a317b1bf658d912b84b
font_01_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 11476 bytes
SHA-256: 9e7b831831801053a67c4ab53e1092a64358e908a8a675a7e4a72d5c975a5d21
font_02_sfnt_off00014f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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