Malicious PDF — malware analysis report

Static analysis result for SHA-256 57771372503b9a39…

MALICIOUS

PDF

75.5 KB Created: 2021-02-21 09:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05cfc6578b532d5d128811753dad1d75 SHA-1: 30b65ef1b40e4ca46a736be2018445cea629a416 SHA-256: 57771372503b9a396a315ba37b875139a57bd94a50bcfcc2bd3e852413be6206
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on cloud storage and various websites. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

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://druttle.ru/wb?keyword=the%20paradox%20of%20choice%20book%20review PDF link annotation
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/734939.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/rikuge_razedojaxejax_fogevoperu_joselim.pdfIn PDF document text
    • http://obmenkalnr.online/floor_plan_template_microsoft_word_2013hx24n.pdfIn PDF document text
    • http://trokot-newshop.online/konuwovexaxilupiwowj3hy1.pdfIn PDF document text
    • http://cenderaoriginator.com/anveshi_jain_app_apkih4kc.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/hNMjglG/fabikasibibekuguvevepa.pdfIn PDF document text
    • http://emirofficialzm.com/batajeweruzazbevv.pdfIn PDF document text
    • http://repochka.site/80243662505d1nfe.pdfIn PDF document text
    • http://healthytrands.com/56504540499uxw3n.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/collector_guideline_rate_bhopalsbfjd.pdfIn PDF document text
    • http://mrshadow.net/91240648092e7lr9.pdfIn PDF document text
    • http://front-glass.website/fiforukigoruritubab05fb.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/xonaxevetaf/2790252514.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/centrifugal_pump_performance_curve_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/bms_college_of_engineering_bangalore_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/43435394971.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/53361342053.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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5408 bytes
SHA-256: 0063a85a49fbff40be77c2bcd5a2801be31876da6b85bbb9af89775e2ea5a1eb
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 10916 bytes
SHA-256: 4f4ef17db7eb7633ccac7430705b7ee649ec97bf148706e743ad571258270e10

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