Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9717c444e378e64…

MALICIOUS

PDF

81.1 KB Created: 2021-02-26 06:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 34463d066959314cd2f3bdc3e3403475 SHA-1: 2871d2d0b46fa9be87bec2e17206baad4c7c8d17 SHA-256: e9717c444e378e6423d38657a6696fa65a489a91db928c923652744419b4cd8c
204 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to SEO redirectors. The primary redirector URL is https://jottigo.ru/strik?utm_term=where+can+i+go+on+holiday+abroad+from+scotland, which is likely used to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=where+can+i+go+on+holiday+abroad+from+scotland PDF link annotation
    • https://geziduvugizi.weebly.com/uploads/1/3/4/8/134862990/puruz.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/zusematewulox.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/7218945.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/88315788053.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/xovevugetedaketojonelarex8oh6p.pdfIn PDF document text
    • http://diwolekeku.22web.org/how_to_change_battery_in_3m_filtrete_thermostat.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/ambit_energy_consumer_reports.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/rikiri_tigefokun_viwawumik.pdfIn PDF document text
    • http://solhq.xyz/csec_social_studies_past_papers_and_answers8iirw.pdfIn PDF document text
    • http://xploitcrew.io/rilazomusesuvobavajabafoaa0l3.pdfIn PDF document text
    • http://uaportal.site/star_wars_sound_effects_free8q660.pdfIn PDF document text
    • https://gezajinesobovu.weebly.com/uploads/1/3/2/3/132303035/vopaxiso-dulezolokuzopas-bamoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/writing_a_bibliography_apa_format_with_websites.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/37129689465.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/32498549575.pdfIn PDF document text
    • http://visowad.epizy.com/lotusebimejeluna.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/will_galaxy_note_9_get_android_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bhangra_new_punjabi_song.pdfIn PDF document text
    • http://zupotid.epizy.com/49104806347.pdfIn PDF document text
    • http://fegatiteberev.epizy.com/concerning_crossword_answer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5480 bytes
SHA-256: aa874adf543fef725f86fb01e51a066a6d6c6cb87b86f155ec8fd805507480b7
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10176 bytes
SHA-256: 0af0286a9b0897c02f9b29eebba7d6977cd447efe8619ef3b41199a31d0eea9e
font_02_sfnt_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2