Malicious PDF — malware analysis report

Static analysis result for SHA-256 259ec03c5796b719…

MALICIOUS

PDF

69.3 KB Created: 2021-02-23 05:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a7cc1bd080f86176bb5e62628a207bb3 SHA-1: 0f526da04fc8cbbac2e9bd8c7203822a5110ef3e SHA-256: 259ec03c5796b71939e31491b405fdc8ceb9bbfc60cc456e17e4e5757fcf7d3f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest it's designed to lure users to external, potentially harmful, sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=english+articles+for+beginners+exercises In PDF document text
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/digutodazofup_gozimupibakegin.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/qPZvhdw/43165448466.pdfIn PDF document text
    • https://xurulojoxog.weebly.com/uploads/1/3/5/3/135323168/rufigamupogewofegid.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/aih1gdg/22467499863.pdfIn PDF document text
    • http://gerakaxow.22web.org/nenomokuge.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/4ba3201bc.pdfIn PDF document text
    • https://vozomazusow.weebly.com/uploads/1/3/4/5/134510153/8a62ef1b0f1f.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/ogdqxhb/fijomasosozi.pdfIn PDF document text
    • http://guzowomofe.iblogger.org/good_quotes_from_le_petit_prince_en_francais.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/61949819191.pdfIn PDF document text
    • https://puwuvesudalifos.weebly.com/uploads/1/3/0/7/130738622/denakadi.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/Dp3Enif/safaricom_card_recharge_scanner.pdfIn PDF document text
    • http://bavewemelemare.iblogger.org/66431839729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rovikejovejoto.rf.gd/pennsylvania_federal_government_hotel_tax_exempt_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/sujekok.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/gipemo.pdfIn PDF document text
    • http://rexerikilo.epizy.com/83461451162.pdfIn PDF document text
    • http://zizolim.rf.gd/maryland_2018_football_media_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/29234716324.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/abgn_ac_wifi_adapter_driver.pdfIn PDF document text
    • http://jemejuzot.epizy.com/17652308792.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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5308 bytes
SHA-256: a0d8c56ad5bbc865f65e2c91a8c89e4f6bc03a4b5ff1d8e3485eec781a33f430
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 10608 bytes
SHA-256: f599d521d6543520523fdca6577ffa41cba8f9252ea3de408c0d6ad467d3854c

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