Malicious PDF — malware analysis report

Static analysis result for SHA-256 1034fc514b235222…

MALICIOUS

PDF

70.5 KB Created: 2021-02-13 12:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c05aec6a9d92191a40c64a407e53f5ca SHA-1: ade48e0ef9f820dda83caba37a189b116d9b32d9 SHA-256: 1034fc514b235222f8f77508b309db74249f02593ddc190796ac2c6bac505968
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jottigo.ru/123?utm_term=cake+board+size+guide PDF link annotation
    • https://cdn.sqhk.co/seseniluvus/jqR7ggK/crunchyroll_premium_not_working_2020.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/bc87226e3b2a36.pdfIn PDF document text
    • http://znasila.ru/64154167996jcnct.pdfIn PDF document text
    • https://jaxurawutedoma.weebly.com/uploads/1/3/0/7/130739660/medaxulamogodid.pdfIn PDF document text
    • https://pifupiwotuz.weebly.com/uploads/1/3/1/3/131384694/bumako_rejotivi.pdfIn PDF document text
    • http://instup.xyz/wuffy_player_apk_fire_tvvifbw.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/1gcRIV1/cross_stitch_floral_border.pdfIn PDF document text
    • http://zoomita.fun/butudoketabowupeme90do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_601b7b04a72f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_6003c0b615b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_600d5109663ee.pdfIn PDF document text
    • https://cdn.sqhk.co/sijoputolu/BjfhfhI/recording_studio_pic_background.pdfIn PDF document text
    • http://it50life.pro/five_little_ducks_sheet_musichj0vn.pdfIn PDF document text
    • http://educationonline.website/jenis_uji_statistik_parametrik_dan_nonparametrikbvuyb.pdfIn PDF document text
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/jajadakopes.pdfIn PDF document text
    • http://vnatural.space/manual_do_artista_ralph_mayerrnyw8.pdfIn PDF document text
    • http://baltika-trans.ru/anjali_songs_isaiminiz9t2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 5120 bytes
SHA-256: 5181cd9dc8cf6f32f44cd7a0f9f32ea6eb6b25dda7a3397e80b79c94943ad4fd
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10160 bytes
SHA-256: 9ae5d34813acfc5e743f37370e808e1ca9222598b1252f80d992e8e9ef64d36c