Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a5c61d19890b1d…

MALICIOUS

PDF

71.9 KB Created: 2021-02-13 11:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 740a38179aec956dc68656c8a22688e8 SHA-1: 2140c8e379686eefe84744d1f3e47ab61de63077 SHA-256: 59a5c61d19890b1d3a6f86fd92d0560721c165845b489d94db29bfcbcda64c92
156 Risk Score

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 5

  • 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.
  • 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/123?utm_term=envision+algebra+1+answer+key+pdf PDF link annotation
    • http://babbieshop.ru/kajujuxeep0qa.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/gcxiahe/build_stunt_track_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/hcqggbD/nokipanadabuletugiz.pdfIn PDF document text
    • http://zootime.store/slaughter_3_the_rebels_mod_apk_download8ouyw.pdfIn PDF document text
    • http://mrshadow.net/infinitive_verbs_worksheetls3tr.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/tixipizutejijak_mekinafawolali_jaduz_vumofunogifuxa.pdfIn PDF document text
    • http://mydenverneighborhoods.com/40112658068fl7vo.pdfIn PDF document text
    • http://streichpack.online/sword_art_online_2_english_dubbedv782w.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/1749356.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/155bf5cae.pdfIn PDF document text
    • http://uscovidcharts.com/3456702057zk779.pdfIn PDF document text
    • http://cashbackk.site/xepesututubudinabh68nv.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/iaCWgdc/26949502949.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/a0N2qqH/netflix_dvd_rental_plans_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tobaziw/91070957361.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/last_version_of_instagram.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/calitech_work_report.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/zatapiduwatesagerutone.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 5676 bytes
SHA-256: 5d7141bcab6216d3696f1e4fce4abe9c8f38e5a0875680de3f92fc98e0ea7502
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 10552 bytes
SHA-256: 59b975c3144c2bb28ee9bfb13dabb48b72ff686fe50f9f24ee09bfe7d19b9f83

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