Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b4ea50f67fbe11…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 23:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fc5a97476a8fb5475e469bb8acb2c149 SHA-1: cb32219bc7505908c71f693976ec492f1863c440 SHA-256: c3b4ea50f67fbe11b7ed6ba09c5d8e7e55a95ac1da783f9d1abcf2b2880473cc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL points to a site related to online betting, suggesting a phishing or scam lure. No scripts were extracted, but the PDF structure and URL suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=online+cricket+betting+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fecd36085c87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ffd0bcbd0849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_601af453c1371.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/luzof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_604a89e433664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_6047c5944a27b.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/paxid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_6002d05ea9329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_60159a6d6184d.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/930add.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/945beecb29b7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tetigod.rf.gd/32479120892.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/cooling_tower_design_calculations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5883eb3f-005e-43f8-9762-b5fd3c6308bd/cisco_linksys_e2500_reset_password.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/beat_saber_custom_platforms.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/can_i_itunes_on_google_chromebook.pdfIn PDF document text
    • http://zifezerolivuba.epizy.com/animation_video_maker_free.pdfIn PDF document text
    • http://vagujawub.epizy.com/fosijapidovibopotumurugu.pdfIn PDF document text
    • http://giwetov.epizy.com/binubuwitagerojoduzorek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fc3498-be76-4fa3-8a45-5c1b0825fb6d/78328154304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf78281c-4c2d-491d-8e91-0183786e6e6b/the_crown_season_1_episode_7_accuracy.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/19303187894.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/47024908174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf2039d-43eb-43ed-89a4-a1a323ee8b52/bodyweight_exercises_weight_loss_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eadd53f-b4a1-4582-85e6-d5543d84aada/31010124755.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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5156 bytes
SHA-256: 803cdb732044cebd2a045330037f56f8f5d6704d033fed2084e22962841cd811
font_01_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 10916 bytes
SHA-256: 38e42bd37d51e262a5ef31db42b270f40fb44b5b4abd1b121a2d94b1106297e2

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