Malicious PDF — malware analysis report

Static analysis result for SHA-256 706caf1ce6f35129…

MALICIOUS

PDF

100.8 KB Created: 2021-03-13 13:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0959df54d38410fbb35b664428d1c03 SHA-1: 7ae08f49b87e7b2a9fd28ccc7249b59ddae08103 SHA-256: 706caf1ce6f3512958a8f075b365ad48d5a73973154c7f699811d935f8109be7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on S3 buckets and appear to be part of a link farm designed to obscure the actual malicious destination. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/aws?utm_term=you+can+negotiate+anything+free+pdf+download PDF link annotation
    • http://datinge.site/bookkeeping_and_accounting_essentials5122i.pdfIn PDF document text
    • http://tgesheff.xyz/63667970360yfq24.pdfIn PDF document text
    • http://uspex22.online/88537898588u7r4d.pdfIn PDF document text
    • http://shoppermarket.online/how_to_use_magic_bullet_blenderrrxex.pdfIn PDF document text
    • http://beamorem.com/56788113457m6gd6.pdfIn PDF document text
    • http://chunyoo.com/56743122782wis9f.pdfIn PDF document text
    • http://bitekodekejo.iblogger.org/janavede.pdfIn PDF document text
    • http://hydrofthol.space/curso_biomagnetismozdrgv.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/rimejiguvif/69451931885.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/wapawuruneputagow.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/12679698978.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_5950520d17874f8bad7acf7540cabb5d.pdf?index=trueIn PDF document text
    • http://lexupatomenoj.epizy.com/pivunijejawamulubarulisov.pdfIn PDF document text
    • http://topeleseluvon.rf.gd/rationalising_the_denominator_surds.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/58512649680.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/where_to_get_a_rapid_covid_test_in_georgia.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_d46463f066ac49a3bd49ad3530a8dea9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/fall_coloring_sheets_for_middle_school.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_b063907212c0409dba5216741371c168.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_715114b28db64677990f36469d7f8026.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/international_marketing_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/mekonuxipumawiwilawenimom.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_off000148b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B7 5392 bytes
SHA-256: d31ca1acc1a1b73da5aff9ca64c81133c73c6c2ba8f65bc17e9a5f0a52d7ece2
font_01_sfnt_off00015b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B26 11936 bytes
SHA-256: b4245f6925e9d915b099432700c2a64184dedbcdac41e42027e87267e41656f2

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