Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5c249bf41f9f16…

MALICIOUS

PDF

96.2 KB Created: 2021-03-28 16:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d21f2e1495a40859768c78a365f4a520 SHA-1: bcddeb2391139de7bd3b1f781e8fa667a5ed6bfe SHA-256: be5c249bf41f9f1622985e07b15784f6bb70fb147b708541992f2814d173dc64
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic to direct users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=pisciculture+en+bac+hors+sol+pdf PDF link annotation
    • https://bipusisep.weebly.com/uploads/1/3/0/7/130775903/tazusi.pdfIn PDF document text
    • https://vatenesarawe.weebly.com/uploads/1/3/0/7/130775606/1419946.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/57933008902.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/8832b1ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_0291ee2b6cc544ad883b2b967322618e.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_6835fbb9a83f4afd855f71b029d05cd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/567a6057-bad3-4863-99a4-96693f13a339/71545467072.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_57f125a9c1b94de18044289c5a4f5ed8.pdf?index=trueIn PDF document text
    • http://malinaliwul.epizy.com/86739272621.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_24cdf1b096b04ab6a14b4bb5f5ac7675.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_886513d545f44d79936764994ece0e1b.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_dc08a0de599b4848bc9dafcff68efd64.pdf?index=trueIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_b764ed726cd04f5290abb99c9829fb72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/bupukudelogon.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_c2123301fa754b5280ad32eda99917dc.pdf?index=trueIn PDF document text
    • http://rovujanoro.epizy.com/calo_plantar_tratamento.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_3df80d9e230f452db3b810fc536096e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed6326b-d49c-4ea2-b646-a889c98074db/23259752274.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/vesipenubojizipoz.pdfIn PDF document text
    • http://mafavijudewu.rf.gd/dell_latitude_d820_laptop_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/house_on_mango_street_esperanza_siblings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9882b934-1caf-4be7-b27b-2f115571cc77/29596198229.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/regular_verbs_list_english_spanish.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_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 5384 bytes
SHA-256: 4f73918730a07fd3c73157e6cd5f509f9bdc043fdb4344d2db0c5d512224adeb
font_01_sfnt_off000143d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D2 15100 bytes
SHA-256: 18aeda9d0baf0c26f2cf87bfa3a48feab7dab9b3ca3277a665abedf257442e47

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