Malicious PDF — malware analysis report

Static analysis result for SHA-256 b551692175cffc98…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 22:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1b331fc38aaa0e330ec27468bd5aaf30 SHA-1: 300057827a287a30386ac1aca63d53eb29bc8f11 SHA-256: b551692175cffc98c4bce8278c948e10924650cecb340008fce076340b4ab744
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external resources, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, appears to contain text related to film writer salaries, likely a lure to encourage clicks on the malicious links.

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://crophysi.ru/123?utm_term=how+much+do+film+writers+make In PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/absalom_absalom_free.pdfIn PDF document text
    • https://vudubigudimuw.weebly.com/uploads/1/3/4/0/134016717/4840510.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/9270416.pdfIn PDF document text
    • http://nuzanav.22web.org/am_pm_time_full_form.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/fuzafuzeruwit/vizowalepoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/firefox_49_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/vewabuzadenonegus.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/yamaha_rx-v475_arc.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/bolekugopadunaka.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/scientific_method_practice_problems_worksheet_answer_key.pdfIn PDF document text
    • http://kudugumokob.epizy.com/99970566209.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/narasimham_bgm_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/blank_four_lines_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/14459317103.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/unc_academic_planning_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/26640400887.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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 5376 bytes
SHA-256: 1a0a4e1941fd25e6d4667e80b8007c3243a94a3f90aceadaf0d1b253a2e4b279
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10056 bytes
SHA-256: 344d4f0b5723b96f9e3e1bb93d91247311837c2a83f79a07dba9a2d6019aa9db

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