Malicious PDF — malware analysis report

Static analysis result for SHA-256 5320ccda245f9983…

MALICIOUS

PDF

80.2 KB Created: 2021-05-13 18:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 81422df45cbe0f78156a5f998bb41b7c SHA-1: 9af8ad999444291beec69d1155276544bf569a92 SHA-256: 5320ccda245f998357bbb78d61d28751fbb576bc12059158e03bd792b5840628
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=what+are+the+different+21st+century+literature+genres PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368759/normal_6045f4d7366cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fce54c3a286b.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/dobikasukavu/wigimub.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/9693629260.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/best_way_to_learn_calculus_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c718172-c400-4072-914a-3015a062510f/40634666499.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3cc2a45202ad416db14aa60400a6bcb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/way_back_into_love_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60787d4b-ec44-4a6c-8d1b-a1e38b5d8ff5/12765717186.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_a47d202ec8d8434887b66e2c43665be8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/3_day_potty_training_method_nap_time.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/periodic_table_families_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/pikusifixumowumogimoker.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_f402b1613e76453dab21973b0c10d45b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/7149703396.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/youtube_amazing_grace_my_chains_are_gone_pentatonix.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/format_xml_in_notepad_7._5._6.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_24a8f8a2650c4dd9bec259456ad09faf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudurat/anydesk_free_software.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_73a4b6d2fb7b4dae885c64f5e7796de9.pdf?index=trueIn 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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 5584 bytes
SHA-256: 9fb56f7efaa8a061673d3b6c58cd4a53ab2003aad6c2eb07bdde5a454d5ca455
font_01_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 10844 bytes
SHA-256: a0cfdd62e6f4528a336454a6b61495a86476dfe3259f94339ce1018f91ca86dc

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