Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2080380d38af198…

MALICIOUS

PDF

79.9 KB Created: 2021-02-16 00:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d4f0bdd2c3b2eeb61b05b41b0a49406 SHA-1: e7681841777bc4373e6e0e79bb1cbf03a4108c17 SHA-256: f2080380d38af1985f48d7949cd9ba9d15175cc91ddc4d500f7bb77205e22155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or scam attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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://leonvi.ru/strik?utm_term=shrek+book+1990 PDF link annotation
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/8e285cdd.pdfIn PDF document text
    • http://keksik24.ru/philips_respironics_system_one_remstar_auto_a_flex_service_requiredm7pmv.pdfIn PDF document text
    • http://dolanuja.iblogger.org/familololafevodamumo.pdfIn PDF document text
    • http://xikumidevulofo.iblogger.org/vopifabefurudefekada.pdfIn PDF document text
    • http://beach-fruit.fun/sazuladufuzotvo6m.pdfIn PDF document text
    • http://trysoda.pro/door_opening_sound_effecthb5rq.pdfIn PDF document text
    • http://wrinklestiltskin.com/saxukilurolopokob5gkt.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
    • http://tivapatovike.epizy.com/booklet_templates_google_docs.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/clcss_subsidy_scheme_guidelines.pdfIn PDF document text
    • http://loxometos.epizy.com/assistive_touch_apk_uptodown.pdfIn PDF document text
    • http://kodataruturi.rf.gd/conners_parent_rating_scale_score_sheet.pdfIn PDF document text
    • http://vububogux.epizy.com/pivutufozodokiv.pdfIn PDF document text
    • http://tuxizosog.rf.gd/14749109912.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/cambrian_period_ep_24_eng_sub.pdfIn PDF document text
    • http://segixiw.epizy.com/70885386690.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 4564 bytes
SHA-256: 0bc409ad03924d3f6e60014ad62b8317e719ad6847cab37dbde6d9cd3b8792d5
font_01_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 11052 bytes
SHA-256: 9ebfccb097e4b6074c36337dc03cb0c4f342ff3366c1a5b092f451233b099dff
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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