Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7bcabe93906021…

MALICIOUS

PDF

75.1 KB Created: 2021-04-16 22:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2934a4c490792dfc504863364ddcbc SHA-1: 2476a7ce3d502433ec04a56301673be9bec88be4 SHA-256: aa7bcabe93906021a046fb2049d2aae9ddd216d8d445f49b054d8a8e790235c3
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating suspicious links and is flagged by a machine learning classifier and ClamAV as malicious. One of the primary links, disguised as a game trailer, leads to a secondary PDF hosted on a suspicious domain, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple suspicious URLs points to a phishing lure.

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://kuzutuzo.ru/strik?utm_term=what+is+final+fantasy+15+royal+edition
    • http://naturelofo.mypressonline.com/understanding_business_finance.pdf
    • http://securitycheckingbrowservkcom.xyz/fallen_order_star_wars_trailerjwk1s.pdf
    • http://vazutokidoxe.iblogger.org/hydraulic_accumulator_circuit.pdf
    • http://soldonlittleton.com/brother_sewing_e1_erroretkp1.pdf
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/0f401c.pdf
    • http://tetoxukipim.getenjoyment.net/dupadixudesirugafatujit.pdf
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/6d45b34c8b44b0a.pdf
    • http://filanion.online/toyota_gracenote_update_downloadrmyhc.pdf
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/3629455.pdf
    • http://onlineeshop24.xyz/munizanifutemidedodexekqlwc.pdf
    • http://zatodawu.iblogger.org/gusosavuvixiju.pdf
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/sufixivajuxexo_xetifomemapi_wefazebebugof.pdf
    • http://lasabobobatir.22web.org/mowanawixabogiwid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viwoxuz/aws_jupyter_notebook_install_package.pdf
    • http://nojatajof.rf.gd/aston_martin_v8_vantage_workshop_manual.pdf
    • https://s3.amazonaws.com/vufuzewasi/91955715182.pdf
    • https://s3.amazonaws.com/zazelujeju/what_is_a_mercury_xr6.pdf
    • https://s3.amazonaws.com/pezofut/advanced_english_grammar_course__toefl_and_ielts.pdf
    • http://zogoxuf.atwebpages.com/kirajegozopi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e845.bin
646bc0e6b1359ee56c5a2acaf11f4407ff49cf4af35e3752a23c88b6729a1674		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 5288 bytes
font_01_sfnt_off0000fa5c.bin
b27330568b07efb4b64d13778443bed2122ff4f4a31e1d2bf1059b1af8ba4d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10820 bytes

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