Malicious PDF — malware analysis report

Static analysis result for SHA-256 637a78b998670fe3…

MALICIOUS

PDF

66.7 KB Created: 2021-01-24 14:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 215188c6a4a6966037e6997369b11f7e SHA-1: 1a4f83f361912e39722d1f445ff607f087639bba SHA-256: 637a78b998670fe3b715c92036e9e7ef9886fcb8810f965373a0712e7ed5fe1a
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. While no scripts were directly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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.
  • 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://crophysi.ru/123?utm_term=e46+manual+transmission+crossmember In PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5feb7e9b0dd25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378613/normal_60082154ed62e.pdfIn PDF document text
    • https://voxugenones.weebly.com/uploads/1/3/1/8/131871951/03609.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/jjhhgcC/pixel_gun_3d_multiplayer_shooter_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_600abfb8e1774.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/eQhhgge/neon_city_cyberpunk_art.pdfIn PDF document text
    • https://cdn.sqhk.co/xewebevij/a3hjeif/prime_knife_hit.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/gosenigovopi.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/cRsWhbW/online_birthday_cake_with_name_and_picture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fccd2ed858c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ff4737aa1371.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/liguwubore/ask_for_payment_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/24246779731.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/49553389092.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/bifotuzerelewevoluwaxamap.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/hong_kong_visa_application_form_in_nigeria.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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 5284 bytes
SHA-256: 05e34edc12bac1adde2caff67da8df965511d27aa9146c9328f4f4a959f3e2bb
font_01_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 10960 bytes
SHA-256: e7330a0db223f410354e0c483496ae4147abc31697929cc3e7c3627f68c1f2eb

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