Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5b5f0ee7f38abc…

MALICIOUS

PDF

90.5 KB Created: 2021-02-20 21:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 634e22a5674c86603c8948d583408133 SHA-1: 3134405f65923d5b5e9ebee220c575146c22d3ef SHA-256: 2b5b5f0ee7f38abc1e010a761d600791f4e1e940b2ba3d1d0525318516cac0d7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a technical reference guide, a common lure for phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs strongly suggests an attempt to redirect the user to a malicious site.

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 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=serena+pvcs+version+manager+command-line+reference+guide PDF link annotation
    • https://fopabitibomasad.weebly.com/uploads/1/3/1/8/131857723/fa5c68c4011.pdfIn PDF document text
    • http://ruzagasaz.iblogger.org/92215330850.pdfIn PDF document text
    • http://nutisoda.22web.org/audition_cc_adobe.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/74fa504be59fa1.pdfIn PDF document text
    • http://gouliwer.online/renesas_electronics_usb_3.0_host_controller_code_10jhsgj.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/9567396.pdfIn PDF document text
    • http://xokesate.22web.org/same_love_macklemore_piano_sheet_music.pdfIn PDF document text
    • http://fiselijuduguge.iblogger.org/arnold_chiari_malformation_radiology_rsna.pdfIn PDF document text
    • http://itnegozio.info/873617007992n253.pdfIn PDF document text
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/domiwuwe_wixovefa_rixamatusaxanu.pdfIn PDF document text
    • http://filemarker.store/contoh_soal_tkb_guru_agama_islameg8rl.pdfIn PDF document text
    • http://nikecortez.net/5083568146968c7y.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/dosirarikofiput.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://lobidirubegevil.epizy.com/cookie_sheet_chicken_pot_pie.pdfIn PDF document text
    • http://jomerijokera.rf.gd/horned_lizard_care_sheet.pdfIn PDF document text
    • http://mofodozudejafej.rf.gd/najizebozujedojoferolow.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/apple_bonjour_free_windows.pdfIn PDF document text
    • http://zilomit.epizy.com/ver_significado_de_la_palabra_languidecer.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_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 5472 bytes
SHA-256: 854c07c64632856b8fbb3e3366c24f3682fa88bb80d7ef2b157e0c17dfd3a4b6
font_01_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 15568 bytes
SHA-256: e5c2c5fd27791433245efbdf92497c620b86a7adc2339b430944cf58c3928624
font_02_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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