Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90c3fe26e16613d…

MALICIOUS

PDF

90.3 KB Created: 2021-03-24 04:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c827a894843e59d39ac24d0d95e86d SHA-1: eae377d47c7b9d7091f939362c6ffb080b7c0255 SHA-256: a90c3fe26e16613d6bd78f9cbc42c11b305dd48da1168500b6301e0d7db1b6e2
196 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 point to potentially malicious domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a precursor to delivering a password-protected malicious archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://leonvi.ru/wix?keyword=mettler+toledo+seven+easy+ph+manual
    • http://zidefekatekuzip.iblogger.org/dell_precision_t5500_bios_password.pdf
    • http://leyloften.online/wupogejejuwuvixiwl4de.pdf
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/timadewek_lupafamevo_vemopegulo_tujigapofarolo.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/sadurabapun.pdf
    • http://hookup755.fun/880870519702s6k.pdf
    • http://muvirire.22web.org/61434154949.pdf
    • http://fuwenosod.iblogger.org/chernobyl_rating_parents_guide.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/tevawofe.pdf
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/367636.pdf
    • https://daxeluneb.weebly.com/uploads/1/3/4/3/134324592/modaregoleti.pdf
    • https://cdn-cms.f-static.net/uploads/4502245/normal_5fdaecac6336f.pdf
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/4042357.pdf
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/tewifaxurut.pdf
    • http://porn77.design/o_mundo_de_sofia_filme_completo_dublado_downloadx4hms.pdf
    • https://dilopapavi.weebly.com/uploads/1/3/4/7/134705518/1847516.pdf
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5ffa21df46214.pdf
    • http://sq11mini.com/how_to_cite_internet_sources_in_text_harvard_stylek6151.pdf
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6058a898b0224.pdf
    • https://static.s123-cdn-static.com/uploads/4426696/normal_6005f0954c40b.pdf
    • http://creditscoretracking.info/tratamiento_de_la_trombosis_venosa_profunda_en_el_embarazoek48p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jajuzasalikirut/project_terms_of_reference_tor_template.pdf
    • https://s3.amazonaws.com/papuja/90431888779.pdf
    • http://jazupizewatabal.epizy.com/69408951067.pdf
    • http://lapekekefexe.rf.gd/alphabet_worksheets_a_z_with_pictures.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121ed.bin
c217707ee72a768fe7d4ca5382d7e130a8d54b958ca8f52623f18007792164f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 5368 bytes
font_01_sfnt_off00013416.bin
29009d8e8c4b261566c60442e11c6adf9b1988f6daef74353085939dc4bca88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 13348 bytes

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