Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b82f03c534d8125…

MALICIOUS

PDF

73.8 KB Created: 2021-01-28 11:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c72711feb24f0ea8fe1acca9a109c460 SHA-1: 32a3a65ba4f20978d6ff671d481517e314cfc5bd SHA-256: 4b82f03c534d812500e96ed2996504d9a53505c2c0e45273fe17979068872cf2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirectors and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were extracted, the PDF structure itself is used to host and distribute these malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/123?utm_term=property+management+policy+and+procedure+manual In PDF document text
    • https://cdn.sqhk.co/pozigafo/ichhhiE/dragon_drill_machine_price_flipkart.pdfIn PDF document text
    • https://kuxozofaxaxasij.weebly.com/uploads/1/3/5/3/135325708/cdcc8.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/UIr88K7/14192284714.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/ge5jHji/1863_inn_of_gettysburg_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd78da262fff.pdfIn PDF document text
    • http://sonuzevemuguke.iblogger.org/episode_1001_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hPVdkib/stickers_su_whatsapp_android.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/sonikaxinurozadofosu.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/bXYFgdI/centurylink_login_business.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/votirunosij.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/Tjjifha/nomalokiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420222/normal_5febfb9f43699.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/hagfjbH/19279352517.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/nazekisigiduz/punctuation_passage_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/66157090581.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/angular_form_reset_except_one_field.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/business_english_words_with_meaning.pdfIn PDF document text
    • http://rigirulame.epizy.com/photography_blog_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/anveshi_jain_app_premium_content.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5316 bytes
SHA-256: d43eab78d52710a97991a38f84a13cd11a057353dae6b70c795cd52a7332dcc2
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 9936 bytes
SHA-256: 75be4364f2e152e87e2af7e33fe8a32bae1705e7fedfb4abec5ccfc1f6dde3bb