Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3baacd0d46be85…

MALICIOUS

PDF

72.3 KB Created: 2021-03-28 10:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0531060440e4cbe230beaed0d5d87532 SHA-1: 98cb4d2ec4ed33dd84033b7903de7ba7e0b720e4 SHA-256: 5b3baacd0d46be85f136f5182818ca21608de1edb9e6688dcdd9627ddd0ed780
134 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. It uses an urgency-based lure. 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 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=canceled+by+credit+grantor+credit+report PDF link annotation
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/3673634.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/da16073b1bb578.pdfIn PDF document text
    • http://wazofos.iblogger.org/fimawos.pdfIn PDF document text
    • https://vibejatixulaxa.weebly.com/uploads/1/3/4/1/134131444/mixuzana.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/bejodegalijira-repilebivowojuv-zekikovox.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/kanunovatowafokavem.pdfIn PDF document text
    • http://xinufajororedud.iblogger.org/20056414232.pdfIn PDF document text
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/balijaj_lokip_jemaduv.pdfIn PDF document text
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/4504070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29d8479-3bb3-4391-8b29-9a49808565be/50_verbos_irregulares_en_ingles_y_espaol_en_presente_y_pasado.pdfIn PDF document text
    • http://govokaruvudup.epizy.com/comportamiento_de_los_agentes_economicos.pdfIn PDF document text
    • http://jekojefakowosep.rf.gd/xofisigixu.pdfIn PDF document text
    • http://rimatos.epizy.com/17981960041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2df7aba-c076-4ae5-aec5-59313e8def9c/fg_knot_strength.pdfIn PDF document text
    • http://tatefubuzu.rf.gd/equivalent_fractions_worksheets_for_grade_5.pdfIn PDF document text
    • http://fobunedofakane.rf.gd/zomefuzajejajalovirirol.pdfIn PDF document text
    • http://xifawudezu.epizy.com/72564219797.pdfIn PDF document text
    • http://luxopemuvoxu.rf.gd/dovawuzavetanamuvimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5199e8b-23bd-43ac-870c-b7f0435b156e/myth_of_the_legendary_odysseus_summary.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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 5212 bytes
SHA-256: d7171f4fd5f00b3f74c8d3b7083b713788413e034b22f6e3f24afb7976998fbc
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10832 bytes
SHA-256: 4a11c4e8d061542f97950d39992c091eda69722c9b52d32d113ad0506a40e8e1

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