Malicious PDF — malware analysis report

Static analysis result for SHA-256 4600b8290277c9f4…

MALICIOUS

PDF

68.5 KB Created: 2021-02-18 20:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b0c0a8f6b0c48eb57e7d3d08ea910c81 SHA-1: da7d67cb4132b744017bf0689d798f6494bffd82 SHA-256: 4600b8290277c9f4c066851b7329d38abb0dd0bc815fbce51dfc05148bc98ff5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed for malicious purposes. The presence of a link to a known malicious redirector and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to printer issues, likely a lure to encourage users to click the 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://crophysi.ru/strik?utm_term=brother+hl-3170cdw+not+printing In PDF document text
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/sedonirenuze.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/panurotogi.pdfIn PDF document text
    • https://vunadonugo.weebly.com/uploads/1/3/1/0/131070983/nawepidaxejavedageru.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/xomasuwura.pdfIn PDF document text
    • http://fly-drive.online/xapekaripapesiduebxkr.pdfIn PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/1726212.pdfIn PDF document text
    • http://bomezifubaf.iblogger.org/ask_and_it_is_given_scripture.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/38df1e35.pdfIn PDF document text
    • https://denosofebulapan.weebly.com/uploads/1/3/5/3/135347567/darup.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/2383756.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/oPRjdjf/15764615727.pdfIn PDF document text
    • http://autoport76.online/mopigotatafukojukuroletus8v3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekoguwomigurup.epizy.com/numufob.pdfIn PDF document text
    • http://zozafiromilofin.epizy.com/certificate_attestation_letter_format.pdfIn PDF document text
    • http://jufofokisib.epizy.com/caecilia_lt_std_font_family_free.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/kdigo_guidelines_ckd.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 5556 bytes
SHA-256: 5e75ff9465ee4951d8d7dfa5b67140f70244eafa8b1921a1a81a1a6395399074
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 10312 bytes
SHA-256: 7cef3f4cd8f87af7e2f2afb1f0727a4ed68a4ad3188fbae5ed4bc7d09495dfb9

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