Malicious PDF — malware analysis report

Static analysis result for SHA-256 a412031ab5e07e94…

MALICIOUS

PDF

74.8 KB Created: 2021-01-23 13:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fdfca47017e1cdf7452f4aa8599d3171 SHA-1: 377cb34096e8ada4e5b2efaaaaa608d0ef341569 SHA-256: a412031ab5e07e94f4cf51ddbdf712dcdb66c89fd1b7a42c8456d13d6e0aedad
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'Catalogo moviles movistar pdf', aligning with the lure of a catalog to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=catalogo+moviles+movistar+pdf PDF link annotation
    • https://site-1166704.mozfiles.com/files/1166704/12590310042.pdfIn PDF document text
    • https://site-1180442.mozfiles.com/files/1180442/airplane_movie_mpaa_rating.pdfIn PDF document text
    • https://site-1171969.mozfiles.com/files/1171969/12400571755.pdfIn PDF document text
    • https://site-1171500.mozfiles.com/files/1171500/yeezy_350_black_and_tan.pdfIn PDF document text
    • http://debakabuxaw.22web.org/mofubovade.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/shoes_tied_together_hanging_meaning.pdfIn PDF document text
    • http://xazamobi.66ghz.com/ada_ramp_railing_guidelines.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/47934915773.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/club_car_carryall_1700_operators_manual.pdfIn PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/9660557664.pdfIn PDF document text
    • https://site-1174552.mozfiles.com/files/1174552/attendance_app_android_studio.pdfIn PDF document text
    • https://site-1221949.mozfiles.com/files/1221949/babies_message_ringtone.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
    • https://s3.amazonaws.com/fosagobomap/kifagejaxenobolozufafaj.pdfIn PDF document text
    • http://zetipetarot.rf.gd/duels_champions_pvp_fights_guide.pdfIn PDF document text
    • http://zulexesovo.epizy.com/islamic_economic_system_vs_capitalism.pdfIn PDF document text
    • http://pimorem.epizy.com/93679995774.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/rakejirisokider.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/audit_report_of_private_limited_company_2018.pdfIn PDF document text
    • http://vutakeba.epizy.com/cursive_writing_worksheets_ks1.pdfIn PDF document text
    • http://kegunujav.epizy.com/immovable_property_valuation_report_format.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 5124 bytes
SHA-256: 5e0910c9048e0080193e6480a1b8cd87b491ea0a1b4ce4de5c77aed3c18d2e87
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 11148 bytes
SHA-256: b41add5a8e9203b647c7662c4e03f2050353eabe2a6306aac54f6ca1d84c9118
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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