Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8ce5047cba79df…

MALICIOUS

PDF

71.6 KB Created: 2021-02-25 10:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 19f0ad94fe446c077c5e117e6e178b84 SHA-1: 24a218741b87ef9c6b562cc136894056d4ce4a1f SHA-256: 9f8ce5047cba79df75ebbf5932d4d66887bbdc7ffdede252a6d98e438fb66173
136 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URLs, including one that appears to be a phishing lure related to 'worksheet shading fractions of shapes', suggests the document is designed to trick users into visiting malicious sites. The 'SE_LOLBIN_RUN_COMMAND' heuristic firing further supports the malicious nature by indicating the presence of command execution tokens within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/wix?keyword=worksheet+shading+fractions+of+shapes PDF link annotation
    • http://sfr-espace.best/telekevi9ff1n.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/hajhggf/business_plan_template_powerpoint_2020.pdfIn PDF document text
    • http://streamsweets.com/open_camera_raw_in_photoshop_cs55cugx.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/giponumaluvupazigifofakicv9r7.pdfIn PDF document text
    • http://poroda.site/64562941173rtcd4.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/ihIxjd3/vepidasubezaguridebejaner.pdfIn PDF document text
    • http://bigchance.pw/netgear_cmd31t_manual7hpcr.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/jaKgj0u/hip_hop_producer_pads_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fee109934d00.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ffe84d2ea46a.pdfIn PDF document text
    • http://vavolezabogisop.iblogger.org/size_of_a_ford_ranger_truck_bed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5ffa93d96e99a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ffa09579e333.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/Fhajcie/nuvalesetozenejeredo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6016f9f9e7875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_600b5977adbd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff444d680c92.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/jaKgjIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rusogiwelak.rf.gd/cisco_packet_tracer_official.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 5464 bytes
SHA-256: cf9ee1083eeb444d86b88c57b55809dc52e14d3a85de481252dcbdf03c12d53b
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10100 bytes
SHA-256: 3f4e575759dda0c721ff61f5f08c9ecccba7957ab64a6edfd5d007cf3201907e

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