Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ea99fce3acf832…

MALICIOUS

PDF

79.3 KB Created: 2021-05-12 14:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9c624e5927330bfda67de23de0184da SHA-1: 3e9d6927f7e79498bb5470ae82c70a2a16d82e35 SHA-256: 97ea99fce3acf832599e0dd8f4a647005f067393143e9e64307da45b4a8aec7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=where+can+i+buy+polaroid+300+film PDF link annotation
    • http://thedefenseforge.com/76472175747i7sub.pdfIn PDF document text
    • http://copyrighthelpptteam.com/dark_heresy_2_enemies_beyond5jjj5.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/notogezag.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/antifertility_activity_of_medicinal_plantssvh5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_6048007e29a97.pdfIn PDF document text
    • http://evilcheats.fun/bahubali_movie_hd_video_song_freelsp77.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/5631687.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fcf6a9d34170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_605f51126a460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365602/normal_5fcff0a8ea9f9.pdfIn PDF document text
    • https://lamixanusagexog.weebly.com/uploads/1/3/5/3/135317293/9b812d85eb59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_603c2d6c91071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_6037a3eb91c56.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/xoferuzu/78078442988.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/aci_318-14_descargar.pdfIn PDF document text
    • http://fuxitajudosev.rf.gd/argentometria_quimica_analitica.pdfIn PDF document text
    • http://jivuruponozo.epizy.com/halton_police_incident_reports.pdfIn PDF document text
    • http://buvodadixasiz.epizy.com/apresentao_de_empresa_de_engenharia.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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 5580 bytes
SHA-256: c04798e3e8182cf1080e897a147a617d8fde36333a5bcfe0378b80a1cb204c48
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 11236 bytes
SHA-256: 18b7b1ecfabd6e151ff6698bc35e854c08ff3703b3ccfe4d603a5796cfdbc2aa
font_02_sfnt_off00012230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12230 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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