Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a35b572aa3b3e0…

MALICIOUS

PDF

73.7 KB Created: 2021-02-02 21:17:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4aeb3bd37a2796b76716d8a9ab1da9bf SHA-1: 716f44a005b977576b79dc31791cae912640a846 SHA-256: c7a35b572aa3b3e0ef499e8d51ae67ceab697b44c2bbc58840ab504ef21b85cc
136 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains embedded URLs that lead to suspicious domains, one of which is presented as an invisible link designed to trick the user into downloading another malicious PDF. The document body, though heavily obfuscated, suggests a lure related to study guides or reports.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/123?utm_term=study+guide+module+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fc71f09a5714.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/xitave.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384039/normal_5ffd4b29685db.pdfIn PDF document text
    • http://zinekob.66ghz.com/stock_valuation_report_in_sap_tcode.pdfIn PDF document text
    • http://ch-redirect.icu/kohl_s_senior_discount_online_codewv5id.pdfIn PDF document text
    • http://sukozuxari.22web.org/arabic_mehndi_design_hd_image.pdfIn PDF document text
    • http://shtangye.xyz/acs800_isu_firmware_manual7bgvc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5ffd2a352a179.pdfIn PDF document text
    • http://centerverifybadge.com/19778297744x8o3x.pdfIn PDF document text
    • http://managerprogram.live/super_mario_3d_world_isofubbm.pdfIn PDF document text
    • http://return-0.com/all_recipes_baked_sweet_potato_friesij2jg.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/gakibimiwikata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418391/normal_5fceecfc4eb0d.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/jezobasit/38571149748.pdfIn PDF document text
    • http://nebejobibaveb.epizy.com/albury_nsw_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/examsoft_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/borbaad_movie_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/7569112369.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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 4948 bytes
SHA-256: 3ae57b9ef2308f4e8b15af56170782c8aba5976666302a7ea32c462f2b4b9eeb
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10984 bytes
SHA-256: 0a48225c738040f978660fbed42f14b8ad342e04546fad627559c06171a6acb2

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