Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9992394052d0043…

MALICIOUS

PDF

73.3 KB Created: 2021-02-17 03:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cb7c07afd9e75170387a158536c328f9 SHA-1: 6378ed319832dd8601f89a9d3f3be59f1cb3ef0c SHA-256: f9992394052d0043b297ebdac44414875f03eb6e08f0eb61786c26fc1ca35016
176 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of numerous external links, including a suspicious one to 'baarspo.ru', suggests an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic further indicates a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://baarspo.ru/123?utm_term=el+principito+frances+espa%25C3%25B1ol+pdf PDF link annotation
    • http://kalulib.iblogger.org/meme_template_spongebob.pdfIn PDF document text
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/2154179.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/tawomez.pdfIn PDF document text
    • http://takovod.66ghz.com/19630812783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410186/normal_5fcc3bad13729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6009b173c010e.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/192a9ea7f2bc87.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/kelageketisefuv/bose_noise_cancelling_earphones_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/29423409763.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/70124900020.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/state_texas_affidavit_heirship_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/39949656150.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/doodle_god_2_crafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/what_does_asbestos_cement_sheet_look_like.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/root_file_manager_apkpure.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_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 5316 bytes
SHA-256: 62ea84d486b4c69eb7f329d17b5a6d19422519b1df41cc81012a3bee1c9c634f
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 11340 bytes
SHA-256: 6e6e3e9ac1ec97354f4863b38515bb8647efbe5d12a24ececded2e385c8cd0d9

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