Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94c953d1835d43f…

MALICIOUS

PDF

76.4 KB Created: 2021-01-31 15:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0a27974ca14293c8f640f238283db72 SHA-1: e6c41d6f28152be17a573c13c801f626b4e240e9 SHA-256: a94c953d1835d43f29b0b3db635b8284c99f05768463f14041910969eb0c42b6
264 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of phishing and social engineering. It contains numerous external links, some pointing to suspicious domains, and employs lures such as a download button and password protection for archives to trick users into downloading further malicious content. The presence of embedded links and the overall structure suggest an attempt to distribute malware, likely through a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • 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://jacksth.ru/aws?utm_term=medtronic+carelink+usb+software PDF link annotation
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/47d5dec.pdfIn PDF document text
    • http://findssldz.xyz/jw_library_for_pc_free_downloadzb2ov.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/bangalore_kanchipuram_otobsr06yf.pdfIn PDF document text
    • http://com-servers.online/marshall_marshall_musicfsk59.pdfIn PDF document text
    • http://inmyshtangen.xyz/dai_best_staff_schematicerz06.pdfIn PDF document text
    • http://blognews.top/atomic_habits_bookqkdrc.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/multiplying_and_dividing_rational_expressions_practicem9q8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_600b39bbc94e4.pdfIn PDF document text
    • http://managerprogram.live/jetpack_joyride_2_apk_modq5fiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5ffe2c56ce8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5ff5ddf7523eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393033/normal_60058fe145706.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/renomebipetawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5fdf4faade977.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/mosagesomelovu-pubegad.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/jopomodilamego/imf_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/18533812806.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/counting_philippine_money_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/kromosom_manusia.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/xinelu.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5316 bytes
SHA-256: 53f35b1c7e6389501e9fbd37323fc2f5dc9e2e17c3685ae883bd84e79cde9277
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 10992 bytes
SHA-256: 07a4c1d3d65f283810d1c8ccf319ad17e7cf808297cc2ecf8839afe808b01208

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