Malicious PDF — malware analysis report

Static analysis result for SHA-256 c587e10c781d5820…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 18:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 885999b6912166c8d520797c90abb96e SHA-1: c75eee8ae62f089733df01e76e781193bb1548ee SHA-256: c587e10c781d58201d4364c9999e0f66a4435ce01406fc7bdb637c8060ee9708
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. The embedded URLs, such as 'https://leonvi.ru/award?keyword=propiedades+de+los+alcanos+alquenos+y+alquinos+pdf', reinforce this by pointing to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=propiedades+de+los+alcanos+alquenos+y+alquinos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385014/normal_6034d438b2282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412583/normal_5fde39fb64ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_602ede66da833.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/b3dc48b5eea7e.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/1262876.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/177d48998505.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/wukuxilom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_60357277dba47.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/acer_aspire_one_cloudbook_11_hard_drive_upgrade.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pipiso.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/bigetobabufuzoxopanumoz.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/babed.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/makuvugumirunip.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/38550168212.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/dazinibonofobi/carrie_underwood_southbound_live_performance.pdfIn PDF document text
    • http://gefilodeza.myartsonline.com/using_m-audio_fast_track_pro_with_audacity.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/89614163370.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/sabasagimokulul.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/lol_evelynn_aram_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/57220570851.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5380 bytes
SHA-256: 4a4874f9fc0f9256fa3ffc7155ec9cb26387ca5147962697f98d7303405eb1e4
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 11472 bytes
SHA-256: 222cf069b1a9d17d1fdc6e4c60b4904b250e9426451e8af53b2c3daedf805b4f

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