Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1b687534b683d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 05:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 697d6f31e1a5b75f2bb7dbd0ad3c59f6 SHA-1: a366d43368ac0b4af1ac4970f513b73cba732e03 SHA-256: fef1b687534b683d254bed0831f146348f79cf6f666fad9f4d509275c7254ab9
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and hosts external URIs, with one critical heuristic flagging it as a phishing trojan. The embedded URL `https://maypoin.ru/strik?utm_term=tubidy+mp3+download+songs+2020+kenya` suggests a lure related to MP3 downloads, aiming to trick users into visiting a malicious site. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=tubidy+mp3+download+songs+2020+kenya PDF link annotation
    • https://wofibenozoga.weebly.com/uploads/1/3/5/3/135321696/956831.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/fQijc5q/pesajozemesibizanu.pdfIn PDF document text
    • https://manadazalivufud.weebly.com/uploads/1/3/4/3/134358645/zojoruz-talufobaxit-biriziv-vogig.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/nevovumowa/star_chart_orion_big_dipper.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/free_power_of_attorney_form_texas_template.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/xotexipowifadazixasujezi.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/adding_fractions_finding_common_denominator_worksheet.pdfIn PDF document text
    • http://divupovive.epizy.com/microsoft_dynamics_365_on_premise_installation_guide.pdfIn PDF document text
    • http://nuridoxiwe.rf.gd/avery_template_5160_label_size.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/integrated_reporting_council_south_africa.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/math_models_with_applications_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/desi_spiderman_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/purcell_electricity_and_magnetism_solutions.pdfIn PDF document text
    • http://sogaviwezed.rf.gd/command_prompt_hacking_commands_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/animation-_list_android_example.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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 5968 bytes
SHA-256: 3c6918e7d3fa58b7f4fa7561c546da73a4f6761eeee8c563a566499a555f75e7
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 9996 bytes
SHA-256: ab40e5a8823b9392e58de6cc21d7f11bdebd443e4c1d5bb4290c32fe62d9475d

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