Malicious PDF — malware analysis report

Static analysis result for SHA-256 a347bff4a1588ef9…

MALICIOUS

PDF

80.3 KB Created: 2021-02-25 00:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7e82b917b6aa6d681afc1508271079fd SHA-1: c259d4ae17008ddbe490678430abb318dab60cd3 SHA-256: a347bff4a1588ef953deb5b3fe4eb4045aca9c9abea0b5ad87dd7dc8dc1249da
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document body and embedded URLs suggest a lure related to QuickBooks invoices, likely intended to trick users into visiting malicious sites. The PDF also contains a link farm, indicating a potential SEO poisoning or traffic redirection scheme.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/wix?keyword=how+to+apply+credit+memo+to+open+invoice+in+quickbooks+online PDF link annotation
    • https://cdn.sqhk.co/sojowidaz/jEWidjh/3588280288.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/compare_and_contrast_essay_examples_8th_grade.pdfIn PDF document text
    • http://axecheat1.xyz/cnc_tool_changerq5rc.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/7jg8zRI/pikuvonupujafa.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/ff9755b25557922.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/xesigeze/pafoso.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/apollo_justice_case_4_trial_former.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/flask_jinja_template_example.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/61190531088.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/17512779706.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/wegajowafosakitef.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/76370806492.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/tyvek_flexwrap_submittal_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/23350130077.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/rogue_definicion_informatica.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_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 5764 bytes
SHA-256: 4e4acbfcc295e0989911e0d71aed83756058aa974018f9785404fb50b5e5fc3d
font_01_sfnt_off0001103d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103D 10484 bytes
SHA-256: 3c8e6bda38417931bf50bc5b2b13723f101c1ba2b77eae622adb0c31df38d93b

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