Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d03a5382f21304…

MALICIOUS

PDF

82.9 KB Created: 2021-03-12 09:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2cab8ca31b49b51be44e945d07eb8946 SHA-1: 9fb3ccfffbb8a89b2f30f3d3b50207c83b33dbd0 SHA-256: b5d03a5382f21304bcfd63e5722d1b2dc7460712c5d804228bb2d5887da7809f
174 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm on disposable hosting, with one URL pointing to a potential second-stage payload. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into decrypting and opening a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/wix?keyword=www.algebrafunsheets.com+answers+quadratic+regression PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fe33f52950fb.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/dgeJ6jj/defense_legend_2_commander_tower_defense.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/gxfidha/82506410717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_6025fac9a242b.pdfIn PDF document text
    • https://cdn.sqhk.co/jexumumir/jfjgjgo/the_amityville_horror_full_movie_480p.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/h0vjhWZ/xenowerk_apk_uptodown.pdfIn PDF document text
    • http://demask.fun/sharper_image_si637_ionic_breeze_quadrag5zij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6016e3e103257.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/meriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_6045dcdd795c7.pdfIn PDF document text
    • http://pristav.pro/4580082035cmi0v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fe8de7f96909.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/idWjhjo/bogerurewavux.pdfIn PDF document text
    • http://item-get.top/what_does_the_bible_say_about_excesse1tp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_6017b27444ab3.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/zepifudoxapo/60521392987.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/android_7_easter_egg.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/ego-t_vape_pen_blinking_blue.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/92978590242.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/26501663452.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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 5840 bytes
SHA-256: 0912dd71ad9314203b7854fbc2f4d41208b35f5f979da1f58508a137dacb31c1
font_01_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 11284 bytes
SHA-256: 382e4b436711fcdefa88626773c97e793185dcc045fd5cbefc671553b2bb113f

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