Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8169de5ed953ef0…

MALICIOUS

PDF

87.9 KB Created: 2021-03-13 14:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 002e3d1c3b3287cee8f0519b0fd06131 SHA-1: a81fde8e4fe297d6d8e9a80d709260fe3bb257fb SHA-256: b8169de5ed953ef0481a1e3b7a9cfe74f4f7aad9a7c6bf59f0d2e611bddad692
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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://soxebez.ru/award?keyword=adenitis+cervical+tratamiento+pdf PDF link annotation
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/ef2cf99c3b7.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/ba1bae3c2f954.pdfIn PDF document text
    • http://samo-katim.ru/15962020078gif2h.pdfIn PDF document text
    • https://deserekinubolid.weebly.com/uploads/1/3/4/3/134319780/71d9af.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/33212211472.pdfIn PDF document text
    • http://jazeforip.22web.org/vafejuradojapibeva.pdfIn PDF document text
    • http://all-gopro.com/sb_600_wont_flashmn82v.pdfIn PDF document text
    • http://es50off.pro/english_grammar_book_for_kindergartenvptn6.pdfIn PDF document text
    • https://dijovenop.weebly.com/uploads/1/3/4/7/134705939/binar.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/constitucion_de_venezuela_1811_caracteristicas612j2.pdfIn PDF document text
    • http://titoto.xyz/jijif2eak4.pdfIn PDF document text
    • http://upsbox.ru/sag_rates_for_actorswi6n2.pdfIn PDF document text
    • http://mosquito.codes/nec_dt400_manual_voicemailckwo3.pdfIn PDF document text
    • http://7gusevshop.space/events_and_adventures_lawsuitmifyt.pdfIn PDF document text
    • http://bezprovodov.guru/asus_p8z77-v_le_plus_bios8wa4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mibesajaku.epizy.com/weitere_informationen_englisch.pdfIn PDF document text
    • http://juzomebudapok.epizy.com/kasas.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/tatamiwut.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/addition_and_subtraction_of_polynomials_worksheet_answers.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_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 8360 bytes
SHA-256: b77248eb8e0c04bb950637bf0cb6c5065dd26090d5aae2c076c1aaeb2cfcf025
font_01_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 5352 bytes
SHA-256: df00b299463614d5a9aef0f9aa8b9147006ce6e24fe5d5895b69dae8451baffa
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 13224 bytes
SHA-256: 1fd1015fc31d7deb65f5513bbdbdb2b537970131691b05b7c96d55fa91aa48e8

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