Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a423703b7831d3…

MALICIOUS

PDF

72.8 KB Created: 2021-03-25 18:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b5aa143e370c65dd188f4a16fe834233 SHA-1: 10e9e7f50af8a9119abf08b7ea371345d7705f9b SHA-256: d3a423703b7831d303426fdb3d8228ebcdf872e156677b1c6a1af4d4df3b31dc
134 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' further supports a phishing pretext, though the document body itself is heavily obfuscated and does not provide clear textual content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=clinical+pharmacology+laurence+pdf PDF link annotation
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/gijipe-rojorolodeg-ledebowo.pdfIn PDF document text
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/welozutatapaw.pdfIn PDF document text
    • http://appeal-ig.com/office_365_user_instructionscpp5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60490cd7c2ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6026fa86da11d.pdfIn PDF document text
    • http://datinge.site/youtube_max_lucado_recent_sermonsnqxcw.pdfIn PDF document text
    • http://kukukoboda.22web.org/how_to_join_a_granny_square_blanket.pdfIn PDF document text
    • http://konsalting.info/8552520505090o63.pdfIn PDF document text
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/7ed11.pdfIn PDF document text
    • http://tuimag.ru/19289491988027l7.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/9e95b1de035bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_604501c075ebc.pdfIn PDF document text
    • http://expressday.online/stay_alive_mp3_downloadn8x82.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://zumedemuruva.22web.org/sql_server_2016_express_edition_sp2.pdfIn PDF document text
    • http://mexicotop3.xyz/809561089184a37v.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/2669467.pdfIn PDF document text
    • http://profoto22.ru/development_as_freedom_bookvbomp.pdfIn PDF document text
    • http://abanca-electronica.com/how_to_write_an_expository_essay_thesis403o1.pdfIn PDF document text
    • http://vipmanmarket.space/basic_econometrics_damodar_gujarati_ppt36drs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixupokolaxusuv.epizy.com/all_my_friends_are_dead_push_me_to_the_edge_song_id.pdfIn PDF document text
    • http://vevofiwimim.epizy.com/96673543912.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 5400 bytes
SHA-256: 4c0145e762328d6ea0b0e9b3cd058dd370555829894008f345180f18c8f5a5dd
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 10704 bytes
SHA-256: a128bdfd1fb5377744fb7141b9a018ee347e49016f9ea08e5fe8a4b6885c9042

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