Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dbb824cb99b8e4…

MALICIOUS

PDF

74.4 KB Created: 2021-02-15 23:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: cb5adb928e9ce78e6d026027f8027851 SHA-1: 5f16964ab9e75b00d2b2a2230711c7ecfe6d3244 SHA-256: a9dbb824cb99b8e4127bf2a02e15c756a933853ed94f3823b08e6eaceaef9b95
222 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/shook?utm_term=musicians+friend+coupons+august+2020 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fe4378f6cf80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5fe04e1c6547d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fc7bff3b5bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6019751e5737c.pdfIn PDF document text
    • http://rinobozawizuvew.iblogger.org/sincere_apology_formal_letter.pdfIn PDF document text
    • http://vagokij.iblogger.org/57589478371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_600de66359fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427506/normal_60043e64c5f4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5ffa7ccf823c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fdbb574139fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repenebaroregom.rf.gd/noduluzuxujanadus.pdfIn PDF document text
    • http://zugejono.epizy.com/legal_guidelines_for_car_seats.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/free_8th_grade_math_word_problems_worksheets.pdfIn PDF document text
    • http://digimoxesimukus.rf.gd/bonjour_mon_ami_font_free.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/agendas_alternatives_and_public_policies_free.pdfIn PDF document text
    • http://xedonufil.rf.gd/beltone_hearing_aid_app_for_android.pdfIn PDF document text
    • http://gisipusizen.rf.gd/armored_god_apk_mod.pdfIn PDF document text
    • http://susesibukof.epizy.com/30733978706.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5572 bytes
SHA-256: 10d457f77329fe644462f27739ddb143387601cbd4971191ed718f0c4da57f9e
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10980 bytes
SHA-256: 4f3b5d557251166d61630375dac97224f035a80ca74be6e6921e115d79580fef