Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb447dcd1987fd2…

MALICIOUS

PDF

71.7 KB Created: 2021-02-19 03:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0ef71b380ab37f43ee67539b26f9c59 SHA-1: 5759dc0f8516cac70839878023cece2c89f73543 SHA-256: 5fb447dcd1987fd289b4134195d46c5de7a4796fe847c669db27d3bd79ffd704
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically for phishing. The document body, though heavily obfuscated, contains references to printer models and instructions, likely serving as a lure. The presence of numerous external URLs, including one identified as a link farm on disposable hosting, strongly suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/wb?keyword=canon%20mp11dx%20calculator%20how%20to%20load%20paper PDF link annotation
    • http://springtea.space/hp_smart_printerl5dl6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5ff295fb44d64.pdfIn PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/pijagategupus.pdfIn PDF document text
    • http://walletelectrum.buzz/craftsman_cost_bookbl939.pdfIn PDF document text
    • http://deemonatrafik.xyz/chemistry_sura_guide_download0h8v0.pdfIn PDF document text
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/rofutudi_tabadex_kaxetopafa_bojokiwobukor.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/lathe_simulator_lite_mod_apk_revdl6i0lw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5ff4cec2a40aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapofekeba.rf.gd/74940557560.pdfIn PDF document text
    • http://pibimosozo.rf.gd/tactic_for_listening_basic.pdfIn PDF document text
    • http://jufawananifufa.rf.gd/newavezovabowovutamolama.pdfIn PDF document text
    • http://fabotiwes.rf.gd/english_grammar__in_use__4th_edition__book_with_answers_and_cd-_ro.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/corki_guide_8._13.pdfIn PDF document text
    • http://fojijiguvixano.rf.gd/63522466905.pdfIn PDF document text
    • http://pazugovaru.rf.gd/tulisan_arab_asmaul_husna_dan_artinya.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_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 5252 bytes
SHA-256: fad8b3acba7ac6fd4a6e28f8921a5ed973de9262bf8505836d7ce88b3bb49ba1
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10796 bytes
SHA-256: 99082ea8c01db235ae5797d539202408ad25f6544cd2117f7c83237d07b66e1c

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