Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc6274d002b7bc2…

MALICIOUS

PDF

141.6 KB Created: 2021-03-13 16:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3784b5f582ae1fb03d6159ca83022ce8 SHA-1: 711e0b705cbb027572d7f83a6391b61cbf1fb61b SHA-256: 4cc6274d002b7bc2de271d52d4da3479d8562ab3736f1be0780e5f109436c0d5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, characteristic of link farms used for phishing or malware distribution. The PDF structure and embedded URIs suggest it's designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://pelibifir.ru/aws?utm_term=top+notch+fundamentals+b+workbook+answer+key+unit+11
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fef3c0155210.pdf
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/rabiromefeziz.pdf
    • http://mujododaziwato.scienceontheweb.net/fopamuginusugulidav.pdf
    • https://static.s123-cdn-static.com/uploads/4488092/normal_6008b681cb10f.pdf
    • http://raxewaponoxiv.mygamesonline.org/sezit.pdf
    • http://madewithsunshine.com/anatomy_of_male_body4nzyq.pdf
    • http://umkatrade.ru/california_notary_acknowledgment_form_2018ez1wj.pdf
    • http://chaptejvxz.fun/498222826318zsv6.pdf
    • http://axecheat1.xyz/learning_php_mysql_and_javascript_wivn06w.pdf
    • http://claire-irk.ru/what_are_social_influences_in_marketing0mpj6.pdf
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/af38f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4acbd9b9-78d0-4e60-8abd-08593f6db3de/fekopokidutolobaje.pdf
    • https://uploads.strikinglycdn.com/files/c0e5e4ff-ab30-4019-944e-8b08e25a3168/rosorirof.pdf
    • http://kubomefewofumim.atwebpages.com/physics_class_10_cbse_light_reflection_and_refraction_numericals.pdf
    • http://bumejefivoxigo.myartsonline.com/asynchronous_counter.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d379.bin
ce9937297fa7b5fd23e284c9e0fb9acf0c81e38b5be5d28fd9d7a2d18fefd5e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D379 5792 bytes
font_01_sfnt_off0001e720.bin
8e2d537ef72bad914a2c756f1039eb868d0d0423324f1b4734e17efd277bc160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E720 13032 bytes
font_02_sfnt_off00021321.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21321 16204 bytes

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