Malicious PDF — malware analysis report

Static analysis result for SHA-256 5853bfe2d68334fe…

MALICIOUS

PDF

94.5 KB Created: 2021-05-16 00:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 31a475555e1a36b4670acbca227e07cc SHA-1: 2054dddd316d1da2eb1f4efb5ad9d9f6f7485ba6 SHA-256: 5853bfe2d68334fe5eb4c7521e6cbefbfed31cee3c93e52b3a1083f742f77253
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=yamaha+htr+6130+hdmi+arc PDF link annotation
    • http://byt-upak.ru/60055280528am98g.pdfIn PDF document text
    • http://wosozage.mypressonline.com/best_diy_shooting_sticks.pdfIn PDF document text
    • http://mklhhhh.space/beloved_1998_online_freeqpaf4.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/4285727.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/gataxixaxu.pdfIn PDF document text
    • http://zojekepilawa.iblogger.org/how_big_is_the_prime_rib_at_boston_market.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/wozib.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/btec_level_3_construction_and_the_built_environment_book.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/advanced_pivot_table_excel_2020_tutorial.pdfIn PDF document text
    • http://salonvarna.com/duvesuzasie2rtp.pdfIn PDF document text
    • http://santecmb-sarl.com/97370470990jig9m.pdfIn PDF document text
    • http://twenty-promo2020.ru/ritikubaxukoxesexusobozdhgq7.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/2d662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/50753896842.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/automotive_lighting_technology.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/86992943125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbbb827d-fee4-4153-9605-165a381f9521/intellicharger_i2_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a947514-b4f3-4b94-8fa9-3f4c10d52a79/xegefezexatoxitaxuma.pdfIn PDF document text
    • http://vedelobezab.rf.gd/mobafeguxomumoviraxipi.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/core_java_course_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acfe07b0-169a-425b-87e6-d3754250d764/how_to_adjust_weight_watchers_scale.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_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 5444 bytes
SHA-256: 22faff2f228f58f617eb9753f5355958704601cc387745159d7277ac6e10f703
font_01_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 12412 bytes
SHA-256: 72b5ccdf291cf0b07dfe5805616e81971af576f8cecd9bda99e6ace28127f1da
font_02_sfnt_off0001581a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581A 16084 bytes
SHA-256: b778697e4b6ce0ccae7911b6423184e4633bd3eccf4460cac772c98ad637a855

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