Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b8fb5385d27e1e…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 09:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c8257f5cde463514ac45ac92a42b9c65 SHA-1: d79725c33c74c48262ad5da06b5949f85e35d1f7 SHA-256: 53b8fb5385d27e1e0b3558a981981c4d9ed0f6bb095ff4b795d1f1402788b237
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The embedded URL `https://zajinet.ru/wix?keyword=rational+numbers+word+problems+worksheet+grade+7` is identified as the primary redirection target. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/wix?keyword=rational+numbers+word+problems+worksheet+grade+7 PDF link annotation
    • https://cdn.sqhk.co/nexasolonit/ejfgqwW/home_assistant_alexa_integration.pdfIn PDF document text
    • http://anarchymedya.com/free_music_video_maker_appy7pu0.pdfIn PDF document text
    • http://doctorzlo.com/33758083927y4nht.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/kjdeD5y/takumi_drift_legend_apk.pdfIn PDF document text
    • http://gutprod.xyz/what_is_advantium_microwaveug5ug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_601f9fbd8d3bd.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/Wxjjhb4/basketball_shooter_king_2_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fe25966a6462.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/ii1idgg/lipilopojalakogelitifija.pdfIn PDF document text
    • http://nasty666.space/tigerheart_s_shadow34riv.pdfIn PDF document text
    • http://ogranicbio.fun/lemixotixabibaposidadete27kp9.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/Hxmyigz/shiftgig_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/giujejh/fejafevolefovokawowajot.pdfIn PDF document text
    • https://cdn.sqhk.co/xidupesijij/qjdhhid/fruit_cut_smash_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/Cgfjd7v/33222626797.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/biwuwukesazef/sscn._bkn._go._id_login_2018_formasi.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/the_hokey_pokey_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/62125915317.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/buwobososuzekumilozap.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/49311840806.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/vampire_diaries_season_3_episode_10_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/credit_report_online_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/90761679907.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/histogram_worksheet_math_9_star.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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 5756 bytes
SHA-256: 3b1b0895e2d00e6c90d8159e2c7943c3535ff8719fd457402d71d22930206f40
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 11512 bytes
SHA-256: 683081f2aa89427efc0e5613f6b4f0ad987513b9105fdd3c2a117c4f0061935d

Open this report in the interactive analyzer, or submit your own file for analysis.