Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ea8e0332d6de5…

MALICIOUS

PDF

68.9 KB Created: 2021-02-12 20:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0142cdac59650c30ee3cc5ed566d7e01 SHA-1: 377b3ed9fe79c9aec994f230dd5c5d3970d3860f SHA-256: 521ea8e0332d6de504fa1ad462d698eaaf76165e82d89a3fab159fb32dfad5cf
134 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing attempt and has been flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'Netflix apk for android 4.4.2', suggesting a lure for users seeking software. The presence of multiple external URIs, including one pointing to 'maypoin.ru', further supports the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wb?keyword=netflix%20apk%20for%20android%204.%204.%202 PDF link annotation
    • http://gifozazupu.iblogger.org/comic_book_template_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_601fb72dd221f.pdfIn PDF document text
    • https://gurazelifu.weebly.com/uploads/1/3/0/8/130874247/xoxibumokefo_jowebemitux_xatapezase.pdfIn PDF document text
    • http://budozezofezuje.iblogger.org/bsplayer_pro_beta_apk.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/butufuwab.pdfIn PDF document text
    • http://firstsecu-paypal.com/citroen_c3_picasso_service_manualx1bru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_5fd8f8b3208db.pdfIn PDF document text
    • https://tiporedoxuva.weebly.com/uploads/1/3/0/7/130740235/8935281.pdfIn PDF document text
    • http://trokot-online.xyz/attendance_tracker_template_xlstuys2.pdfIn PDF document text
    • http://fezelaradelemuj.22web.org/93394470333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5ffc7d513cc94.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/33b6cd.pdfIn PDF document text
    • http://emmetrix.net/wujerujegidufeu83oa.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/guxosa/calculus_full_course.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/atelier_lulua_dlc.pdfIn PDF document text
    • http://zasegusof.epizy.com/zujimebizazas.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/jatawizol.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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 5208 bytes
SHA-256: 4729b5c493bdd97c148c14260756834e71c1964eb8e72db7f035cf6746fbf817
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10780 bytes
SHA-256: 7059250df69db8936e61976f3dd5df7c01a07f5845d7b1cd5012ac4130888d4e

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