Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4fbcd1f46160d0…

MALICIOUS

PDF

125.3 KB Created: 2021-02-18 17:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3450bd502a837a40f0994038b096f91e SHA-1: 77736d1fce71252451e7f8c0d731daa2fc1cc550 SHA-256: cc4fbcd1f46160d037cbb4233c8871036e7ae1a496961986304499d025fdffaa
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to 'Jeux de cartes a 2 simple' and 'wkhtmltopdf', indicating a lure for a card game, likely to disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=jeux+de+cartes+a+2+simple PDF link annotation
    • https://cdn.sqhk.co/rifelefiw/jdhjdTu/kumifanajazuji.pdfIn PDF document text
    • http://sosed.market/football_stream_livep183r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6011dfdd8d6fd.pdfIn PDF document text
    • http://adminhalil.com/27637784909jhiu.pdfIn PDF document text
    • http://sefajoga.iblogger.org/lagu_betrand_peto_kau_takkan_terganti.pdfIn PDF document text
    • http://drovazvenigorod.ru/what_are_the_types_of_organizational_structures_briefly_explain_each9noy7.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/58469458733ioal0.pdfIn PDF document text
    • http://tk-pobeda.site/sog_throwing_knives_amazonfgpr3.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/2H49gfG/59756175713.pdfIn PDF document text
    • http://formblckr1.xyz/74232211522duddz.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/congruent_and_similar_shapes_worksheet_tes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_5fe3146c3ea95.pdfIn PDF document text
    • http://mini-camera-super.club/stremio_android_tv_boxyoa63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugirike.epizy.com/acer_aspire_4752g_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/5766278790.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/blood_pressure_checker_app.pdfIn PDF document text
    • http://tizovosavudufi.rf.gd/employer_job_interview_checklist_template.pdfIn PDF document text
    • http://xarejaxeb.rf.gd/rogolilabarigowatupir.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19615 5408 bytes
SHA-256: b1ffcccf1c252a8090e70943228780ce87f6a9da0462bf336ff60fe62c3558a4
font_01_sfnt_off0001a864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A864 12948 bytes
SHA-256: 1a32725d9bad2c8e7685a2d966f89011a26a300194b460ed556d55e667414784
font_02_sfnt_off0001d127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D127 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7

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