Malicious PDF — malware analysis report

Static analysis result for SHA-256 1121a1803f79af66…

MALICIOUS

PDF

81.7 KB Created: 2021-03-05 06:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5928235f57a3a1406a3d632383d5ced0 SHA-1: 54b32949c776f2a74965a58e45401912ace4c2ce SHA-256: 1121a1803f79af665a9cfc3ac5d6e52a11590724f832fef0aa54e2169da8c5c3
222 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains links to known malicious redirector infrastructure. The presence of a 'download button' heuristic suggests a lure to trick users into downloading further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=baldur%2527s+gate+dark+alliance+pc+emulator In PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/9d5e4.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/hiCUjfj/jotesolubolixufosaravi.pdfIn PDF document text
    • https://cdn.sqhk.co/jovojatubo/gddhdHQ/95331197993.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/926a3862d167b40.pdfIn PDF document text
    • http://dexujin.iblogger.org/dufejasisezufisamilora.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/jKU78jd/rupusanunewosopajalobas.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/jcihjhc/11146798656.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/bynie4m/arabian_horse_running_drawing.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/kukupunopedon/54791710966.pdfIn PDF document text
    • http://daluxufugul.epizy.com/38140633287.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/lokugamazuselojip.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/vizipodegugawujo.pdfIn PDF document text
    • http://muloluj.rf.gd/math_worksheets_for_kindergarten_3.pdfIn PDF document text
    • http://vomoguzidazufi.rf.gd/63380937067.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/lomokasenefoxizibejeke.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/33645877602.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/spring_coloring_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/paxelawasokizuwiwope.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/aaliyah_try_again_audio.pdfIn PDF document text
    • http://ripifozuj.rf.gd/stratus_and_cumulus_clouds_form.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_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 5540 bytes
SHA-256: 6a42ea93dac61194bc6201dcb4e2df1adaba606887424c7fe3bb30eb5f7c98fa
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 15828 bytes
SHA-256: 32241bf263c606f4b2055c8e53f1396f0524195b1db34b116ecc2d104028efaa

Open this report in the interactive analyzer, or submit your own file for analysis.