Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3717f7aa64c922…

MALICIOUS

PDF

82.6 KB Created: 2021-02-28 21:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e845a5da768d5e95fb95d284d19af307 SHA-1: feedd362cf1230eaadcc7256115bcf5d68cae7f7 SHA-256: 3b3717f7aa64c922334f9a2bcab06b971efa49011335a77349fde52e469bc1dd
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, appears to contain text related to router issues, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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=cannot+reset+linksys+wrt120n In PDF document text
    • http://remivawoxowo.22web.org/corey_wayne_book.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/Njghjhe/colornote_for_windows_7_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/MijQjcO/through_the_ages_steam_charts.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/ihjhiKd/prepaid_wifi_promos_globe.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/pgfYmhd/polawozi.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/jaoQjb9/dead_rain_new_zombie_virus_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/ibhjghi/throwing_knives_near_me.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/rogugagatuf/xajuzogonewolox.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/rutadaxizokesezonokami.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/50487881511.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/turojafafereworin.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/gatowuvudogimexu.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/what_kind_of_animal_is_kaa_in_the_jungle_book.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010d52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D52 26776 bytes
SHA-256: e211da3c0b717c6deaa72de8be53381f33026f52a2f59a6747fdcb70d2be7137
font_00_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 5168 bytes
SHA-256: e8ea56eb7302d88b304f878b37d8c2444bc56a9805b24f585adc89caf1f8cae7
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10820 bytes
SHA-256: 5b5709f5991b2ca4f8defb99cebf3d2bde4307480551ab2a543f2c158f23239f

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