Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c59c28c2d664df…

MALICIOUS

PDF

70.7 KB Created: 2021-01-30 18:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1b8b356690cdb78f57da4bd1cdf0744d SHA-1: 7520ef9b708e556ce94441554c00a329ce578c6f SHA-256: c3c59c28c2d664dfa7e1023b52d78d4316dfc22e5ac110eff554dbf1a1d8eecf
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to 'jottigo.ru', indicates a likely attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=d%2526d+5e+xanathar%2527s+guide+to+everything+pdf+google+drive PDF link annotation
    • http://ostanni.fun/773116614494wp6n.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/idjNhgV/sourdough_sandwich_bread_recipe_king_arthur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6014c58b6e507.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/jizijirutotasefi.pdfIn PDF document text
    • http://matroskin.space/biking_the_othello_tunnelsy7j7n.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/9162717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6011e14900af6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5fee09349c1cb.pdfIn PDF document text
    • http://fasibada.22web.org/afrikaans_gospel_music_video.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/9226997.pdfIn PDF document text
    • https://cdn.sqhk.co/nenutipu/fo5olSo/university_of_miami_football_ticket_office.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/hgjeghu/32809726138.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/xalexojaxipud/infinitive_verb_form_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/92569082876.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/41186773584.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/fomedupusaxulakum.pdfIn PDF document text
    • http://musowafotoxipid.epizy.com/altivar_212_programming_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/heretic_gods_android_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42D 4988 bytes
SHA-256: f0ace50c04c300a3ea440f7240fedb38355c625ba7806325947e09e13a9d6f85
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 4156 bytes
SHA-256: d46272a35c141788e45a942f60d3ac75eba256168db5716376ff56f0f84bb3df
font_02_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 12736 bytes
SHA-256: e199da9b3ac023be028bd830df91bf5d687e8685bb7c0e20fcbd21a35e1d95b6

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