Malicious PDF — malware analysis report

Static analysis result for SHA-256 0755e5125f9e6c65…

MALICIOUS

PDF

72.4 KB Created: 2021-01-30 20:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3d3291fdc54bd264fe0d3ee0e5f5e93d SHA-1: 099f4006a59abcf4f8d6c6cabe27adb3931d6834 SHA-256: 0755e5125f9e6c658a3e4ddfaf95ac79e1e6b6ba4fd0458863845838438ed9ef
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically. The numerous embedded URLs point to suspicious domains, likely serving as lures for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=delicious%20blueberry%20pancakes In PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/Eif1Rjc/3712582797.pdfIn PDF document text
    • http://monoga.space/91701636822gurc1.pdfIn PDF document text
    • http://1xbet-regi.site/castle_of_illusion_starring_mickey_mouse_sega_genesismhdyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fd67f264f881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_600d505a72472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb072f8f59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fcbcb9ac1a72.pdfIn PDF document text
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/nenofaritomaxupi.pdfIn PDF document text
    • http://bluetea.space/26632453350b7yan.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/nilititonawafim/best_birthday_party_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/30060901100.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/47329726629.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/apa_reference_writing_style.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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 5232 bytes
SHA-256: f7d39b4cd4681c243f48267f4f6c0f6ac3862952a1948b3f1633a3932509f7bd
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 11256 bytes
SHA-256: 7caf2de008c15c53e4bb9ba81c4e28fdc511de1f5ebbd5f10240de3f8ffd0bd9

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