Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0a509e4160169f…

MALICIOUS

PDF

79.2 KB Created: 2021-01-21 10:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7a15a29adb9428ef2720a0443aa3d82 SHA-1: baa26ddc87d36119c44aa1f68958f85cb0ce8911 SHA-256: fd0a509e4160169f3fb2933fc7123c95d9b277310c34e04cb864b5ff1aef6130
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to funnel users to malicious sites. The ML classifier also strongly indicated maliciousness.

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
  • 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 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://ggtraff.ru/wb?keyword=farm%20heroes%20saga%20hack%20free%20download%20for%20android In PDF document text
    • https://site-1173509.mozfiles.com/files/1173509/dora_and_friends_into_the_city_nick_jr.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/printable_attendance_sheet_for_sunday_school.pdfIn PDF document text
    • https://site-1253364.mozfiles.com/files/1253364/79870547832.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/f90705cd21442b6.pdfIn PDF document text
    • https://site-1248223.mozfiles.com/files/1248223/9740642849.pdfIn PDF document text
    • https://site-1176018.mozfiles.com/files/1176018/33785436515.pdfIn PDF document text
    • https://site-1172851.mozfiles.com/files/1172851/98903401047.pdfIn PDF document text
    • https://godewofevi.weebly.com/uploads/1/3/2/8/132814364/b1a0e67a118c.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/frases_tumblr_de_amor_sad.pdfIn PDF document text
    • https://site-1172801.mozfiles.com/files/1172801/yoox_net_a_porter_annual_report_2018.pdfIn PDF document text
    • https://site-1175554.mozfiles.com/files/1175554/37643802688.pdfIn PDF document text
    • http://kabomodom.iblogger.org/bowmaster_mod_apk_unlock_all_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bisavosimirot.rf.gd/73071591531.pdfIn PDF document text
    • http://maviwapas.epizy.com/97184191990.pdfIn PDF document text
    • http://memaded.epizy.com/burrito_bison_revenge_mod_apk.pdfIn PDF document text
    • http://mukajuzata.rf.gd/vewurifezotulu.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/41514077464.pdfIn PDF document text
    • http://povuputuk.epizy.com/nelijerovipalevi.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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 5548 bytes
SHA-256: 78cc4c2429964091d5562ea9c53c79643b038ffef9b1d43ad2eb54e9d77e6749
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 10644 bytes
SHA-256: 30f8a483ce0f6d0f1d61421761684d9d1370a6fd636efdb88bc0eae19b6db8bc

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