Malicious PDF — malware analysis report

Static analysis result for SHA-256 9598e344244be64d…

MALICIOUS

PDF

80.6 KB Created: 2021-06-10 01:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 23b6e649c00063ce233fc52a6ce8d0ca SHA-1: 4b474d1f46b0602a9c89c5f9cd03f5d5ce6a2880 SHA-256: 9598e344244be64d2b69ea1517174aa254807e87007a271927f7f37ac8143236
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The document body, though heavily obfuscated, contains text related to 'Fortnite anti cheat not installed' and mentions 'wkhtmltopdf', indicating a potential lure to trick users into clicking malicious links. The presence of ML and ClamAV detections, along with the 'ClickFix' heuristic, strongly suggests malicious intent, likely to redirect users to a phishing site or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pixomot.ru/pbw?utm_term=fortnite+anti+cheat+not+installed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6044d8d3b56d8.pdfIn PDF document text
    • https://gukufevekexuse.weebly.com/uploads/1/3/5/3/135305262/tilux.pdfIn PDF document text
    • https://vifinijeg.weebly.com/uploads/1/3/4/4/134479412/zidurel.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/gisumupel-nepakapok.pdfIn PDF document text
    • https://dagatofolake.weebly.com/uploads/1/3/0/8/130874029/eef0de.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/gewepe.pdfIn PDF document text
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/wamajeroboxolu-rudobejejuwi-gotapiwunod.pdfIn PDF document text
    • https://zezazerin.weebly.com/uploads/1/3/1/8/131856191/noriwinaza-konewogega-vijabotesesaluz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_600504c96d026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_601128ab991c4.pdfIn PDF document text
    • https://niritamin.weebly.com/uploads/1/3/4/4/134486676/7033327.pdfIn PDF document text
    • https://fogodaxo.weebly.com/uploads/1/3/4/6/134606017/tebevijor.pdfIn PDF document text
    • https://vavivaso.weebly.com/uploads/1/3/0/8/130873957/3044f06ff6632dc.pdfIn PDF document text
    • https://xuvasilibozin.weebly.com/uploads/1/3/5/3/135335949/6b290da.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/fad4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_6043b768a0989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5feb9792573a5.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/7559371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/566b945d-2738-412a-b394-5fd19855572b/php_for_the_web_visual_quickstart_guide_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a30e6ad5-4b84-4e08-b48e-d4498e8c61b3/what_does_e01_and_f09_mean_on_a_maytag_washer.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 4980 bytes
SHA-256: 2d61ae4e999672a358f6d706f0e5f3728c02979eb61580fdba5ab8feb97b710a
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 11588 bytes
SHA-256: 2cc6f1110b17af966df61ad8210bc00c9638efb0a9adf624c19ce3ef07942fe2
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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