Malicious PDF — malware analysis report

Static analysis result for SHA-256 a730c14918dec4de…

MALICIOUS

PDF

73.7 KB Created: 2021-02-21 12:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 05e56260efcb164badc95571d9c6baf1 SHA-1: 82b6941bc2a2c5e2a3d0d7669c29c6d7205e6639 SHA-256: a730c14918dec4de1006cc0eaa8969078f7cf8e435e696df9f4b19d5b168a2ad
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 embedded URLs, with one pointing to 'jottigo.ru', which is flagged as a potential redirector for malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of seemingly unrelated documents hosted on disposable domains.

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://jottigo.ru/strik?utm_term=motorola+sb6141+turn+off+lights PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff5421669f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxobenona/fijOShd/pro_football_coaches_fined.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Sigjcgf/70038304005.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/gjhcHe1/61721124201.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/iz5ohif/60350096397.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/jajigdK/77885576924.pdfIn PDF document text
    • http://nevoburaferivab.22web.org/wd_2tb_my_passport_ultra_blue_portable_external_hard_drive_usb-c_-_wdbc3c0020bbl-wesn.pdfIn PDF document text
    • http://fosinofabeveso.22web.org/diwozoxikijugegore.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/j4hbjeO/bazifeji.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/Thj9fgh/star_fox_adventures_gamecube_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/EbHidhf/96582211397.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/gegefgd/ziderabozane.pdfIn PDF document text
    • https://cdn.sqhk.co/tovitaxani/x3hbje0/kegefenopivetuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/PgiibSY/gijajegolulepat.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/jovekus/connect_4_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/41601578514.pdfIn PDF document text
    • http://gamemogap.epizy.com/advanced_systemcare_ultimate_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/zimsec_geography_questions_and_answers.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/41425700939.pdfIn PDF document text
    • http://xubedoper.epizy.com/aliya_janell_when_we_video.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_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 2968 bytes
SHA-256: a3409f23d318cb64f50816b13ffa5e4cae8c31e9b9ecf1c6aab81bc325688a60
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 5468 bytes
SHA-256: f55d663b188ce03674583525d70ae5d4854658f149c791870ca4a2a2ec6a20c5
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 11060 bytes
SHA-256: 5a8e1989cf0cf8eb6f99e10f0901c45f4e856f8ae23e950fc34d1360a0945066

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