Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbb70627aa4e773…

MALICIOUS

PDF

65.2 KB Created: 2021-02-20 03:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79e90c6de5ed100de5496a3c68e2dc12 SHA-1: a3a91291d8966a0abec89c7823d0f75e88f09a46 SHA-256: efbb70627aa4e773083863a8fd68f7f66b3a7ead81d80d0693d23d48616dfa0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=life+and+death+in+shanghai+quotes PDF link annotation
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/sofonixefupimol_jixawobidexave.pdfIn PDF document text
    • http://studyweb.site/esports_jersey_template_freevd75i.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/gogikowa.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/tigumodoja.pdfIn PDF document text
    • https://weranatowo.weebly.com/uploads/1/3/1/4/131408071/jinafekixez.pdfIn PDF document text
    • http://italylife.pro/keynote_templates_free9m2io.pdfIn PDF document text
    • http://dazipuv.iblogger.org/logakunubawedaxaxexaj.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/rigoxidagotanuluveg.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/roxuro-nedajapalonip-fajivinusopidi-wemejusa.pdfIn PDF document text
    • http://prizinsta.info/jenofififuzegaworuxuwei2ugc.pdfIn PDF document text
    • http://rukawagamijo.iblogger.org/tuvozewanok.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/wugugow.pdfIn PDF document text
    • https://databuzub.weebly.com/uploads/1/3/4/3/134373368/9876468.pdfIn PDF document text
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/3347357.pdfIn PDF document text
    • http://betmoy56.com/527337940863i2gd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sofidusujewa.epizy.com/57756702998.pdfIn PDF document text
    • http://terezeso.epizy.com/voruvijowomomog.pdfIn PDF document text
    • http://gefuxexo.epizy.com/11738910671.pdfIn PDF document text
    • http://lugopupi.rf.gd/fugirugejo.pdfIn PDF document text
    • http://xupapuxonoxun.rf.gd/calor_de_combustion_del_n-butano.pdfIn PDF document text
    • http://xatudoxi.epizy.com/36367345816.pdfIn PDF document text
    • http://nipizil.epizy.com/is_carmax_maxcare_warranty_worth_it.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 5108 bytes
SHA-256: 09be0f3f1aa3030329bfcbdf9fe3e30c8817da2ddd2d9910f9f1ef5c7373f555
font_01_sfnt_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 10456 bytes
SHA-256: 8f0239264131364215706ef5792822e299fc292126128ef0572a3a923c41a90c

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