Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41310895bfd73b2…

MALICIOUS

PDF

87.3 KB Created: 2021-03-21 03:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5be3844338e8d712091bea37ad29200f SHA-1: ed24f117a7c416aed3e89e9a0a4c13cee2f69681 SHA-256: e41310895bfd73b27d7d60c87ee355b87291a450bb2c05bc4708671f92bf64ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to Cisco certification, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=cisco+ccnp+switching+exam+certification+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/dowepigakaw/ekifgg9/mifunupageseguwobo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/fuLgghi/indycar_races_in_the_us.pdfIn PDF document text
    • http://petersikdar.com/foolproof_module_6_test_version_1.2_answerss17m3.pdfIn PDF document text
    • http://igonlinesupport.com/bulorifidov764if.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_do_you_write_a_thesis_statement_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/5iphfjh/amazon_kindle_fire_7_charger.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/business_funding_proposal_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/jfiajek/31194196150.pdfIn PDF document text
    • http://creditscorerepair.info/6875611011734o7p.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/hawhicV/24642969875.pdfIn PDF document text
    • https://cdn.sqhk.co/tapowifilez/bSLjjgh/logo_maker_shopify_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilogifuxe/DFhiSEg/60897658939.pdfIn PDF document text
    • http://neuroncraft.online/vumekaxomudatisozhjfd.pdfIn PDF document text
    • http://yazansoft.com/text_to_image_synthesis_online0mkgz.pdfIn PDF document text
    • http://fredo.bike/5456212043278lqj.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/vNj2Xge/xajisiwo.pdfIn PDF document text
    • http://onenature.space/airbrush_app_apkpureq0ifp.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/dixaleko/84450209729.pdfIn PDF document text
    • http://jefiferinazubim.atwebpages.com/413424175.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/attack_on_titan_xbox_360_game.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/car_parking_games_2019_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/477005915.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/52272833556.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/entry_level_graphic_designer_salary_nyc.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/tenojaxazuvafalugifugum.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_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 5600 bytes
SHA-256: ec4c968f3c3a4759e145bdb4266540591dc9e6961125a00587238c50e964dfe2
font_01_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 11108 bytes
SHA-256: c892442c081b722253bf0182f212408566cd2e54b153adb7d6e1b27e8385a9cb

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