Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb93ecd733b022e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 01:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99a63b666974a447d33b76c79990c9a0 SHA-1: 891b96e946283caff965f69e55eca6e4b5c07b1f SHA-256: ecb93ecd733b022e4537f2e4439d6355c5dd039709fccf77b98e325ac597a1d6
186 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 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://jottigo.ru/award?keyword=arabic+language+course+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369308/normal_603e366fa7026.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/keruvu_wekorudixaba_fejel.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/albert_camus_francais.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/bible_study_topics_tagalog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_603ea92730ae1.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/jadik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_5fcf945672279.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/f9427d0.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/selotobi.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/0fe58a.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/f4973f18a8.pdfIn PDF document text
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/kovilisul.pdfIn PDF document text
    • https://xumogawas.weebly.com/uploads/1/3/5/3/135341739/a8982c3420.pdfIn PDF document text
    • https://tafulagi.weebly.com/uploads/1/3/4/6/134608062/8223762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_b037476aca044e59a5937a4978260d8c.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_2720b65b5645452ca6e0e98d7353c2f2.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_edaaf1ae052f474cb012b98abb704b42.pdf?index=trueIn PDF document text
    • http://vijiviwo.epizy.com/abnormal_psychology_noun.pdfIn PDF document text
    • http://wegizadix.rf.gd/alstrom_syndrome.pdfIn PDF document text
    • http://bipedok.epizy.com/lakshmi_narasimha_naa_songs_free.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_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 5516 bytes
SHA-256: 8fe3ca02536f81d62abb17841917e36ffdab836972419fae32d934f2f823f3d1
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 10740 bytes
SHA-256: 3b89e589348659895cc74f6cebdc1c045eca6bd3de259e5aae46a62d01dd3e54

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