Malicious PDF — malware analysis report

Static analysis result for SHA-256 9647e3d4e4740b5a…

MALICIOUS

PDF

82.8 KB Created: 2021-02-27 10:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 181560e14b1d8070ca236e438fb54172 SHA-1: 9f1939d92061da93806368fca06e265778edf54d SHA-256: 9647e3d4e4740b5ad736a96ddf95c099aa74cc7794e1c468b2a45ef25fc25843
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('xezojetit.ru') that is flagged as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=proform+740cs+belt+slipping PDF link annotation
    • http://workshop-fb.ru/kindle_ebook_reader_formate36jp.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/how_to_100_links_awakening_switch.pdfIn PDF document text
    • http://pipvip.ru/why_is_my_scooter_not_startinghvm35.pdfIn PDF document text
    • http://znakomstva18x.site/miwoxtdlz4.pdfIn PDF document text
    • http://sis-paypal.com/resume_format_letter_size858gn.pdfIn PDF document text
    • http://nexekeb.iblogger.org/laguxavilisevinuguroma.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/zii6geB/bubina.pdfIn PDF document text
    • http://chestlune.online/forifuxirajexapaw0iyxl.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/bQheShb/48772985331.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/kinuzijolu.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/KiceAVw/lock_screen_message_on_iphone_xr.pdfIn PDF document text
    • http://jotewelife.iblogger.org/angolan_house_music_free.pdfIn PDF document text
    • http://uspeh.icu/positive_mind_meaning_in_urduyj76i.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/list_of_emotional_words_in_hindi.pdfIn PDF document text
    • http://obzorov.site/orange_smoke_pngdgupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kukadafimi.rf.gd/asrock_g41m-_vs3_user_manual.pdfIn PDF document text
    • http://biwovake.rf.gd/wudanagelevewuwuwekazipa.pdfIn PDF document text
    • http://zimopup.myartsonline.com/caps_for_sale_crafts_for_preschoolers.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/soil_mechanics_and_foundation_engineering_made_easy.pdfIn PDF document text
    • http://xefejada.epizy.com/the_tales_of_the_peculiar_book_review.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_off000106a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 5576 bytes
SHA-256: 04f06212832407fab463cd91449041562d22f5846a76c7d590c943eccabdd657
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 10580 bytes
SHA-256: 6f61391505894542136c3c952b4c853d1ab4fce5f3605517fe02e62ee30cfc8d

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