Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed724cc12ebb2ac…

MALICIOUS

PDF

73.9 KB Created: 2021-03-28 10:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5e2c7735144b6d4238dd11e0e793b82e SHA-1: 03deba9e5e6546be66e6fcc5ba3c19baca090b3a SHA-256: fed724cc12ebb2ac7662b415fb54a4fbd7428fbcb7f154a793c5e7f9acfe20eb
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Facebook blueprint exam answers pdf'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/123?utm_term=facebook+blueprint+exam+answers+pdf PDF link annotation
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/bff8c71b01.pdfIn PDF document text
    • http://remontnatali.ru/nuxepunirowowekugumiltil2v.pdfIn PDF document text
    • http://laithub.pro/29206193398zxjl.pdfIn PDF document text
    • https://xoniruzi.weebly.com/uploads/1/3/4/8/134869292/1991464.pdfIn PDF document text
    • http://jomokanus.22web.org/belizagujibobazedupug.pdfIn PDF document text
    • http://ragitikevuwa.22web.org/10013594808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gavazawedego.epizy.com/63623602131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3c2e92-ea1d-4c29-b5a1-b8f1cbd1fff2/kundalini_yoga_meditation_for_beginners.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/actualiser_les_formules_excel_vba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b22b0c-53ba-4327-add3-bb7f977353d6/58443570488.pdfIn PDF document text
    • http://kutegabirena.epizy.com/maths_practice_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c883ca23-6dbb-4955-bc09-59af7afe5672/boy_roald_dahl_chapter_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6143f469-ec33-460a-8626-d357f6f26f70/movosekitulupoki.pdfIn PDF document text
    • http://dodarululi.epizy.com/bestiario_pathfinder_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2682efc-21a5-4aea-bda1-0d12c2745042/modular_origami_triangle_box.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_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 5620 bytes
SHA-256: f6a75f847c417b30ccfe2b8a995a79b278175f5818ee80520f3eeb554d4a481a
font_01_sfnt_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 11052 bytes
SHA-256: c1767d2225d2d2b4c97b84bcba992be7663fae32a3dbe817a5514f378160d5a6

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