Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d48ad779054d56…

MALICIOUS

PDF

74.7 KB Created: 2021-05-26 06:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e46f06024de2c9eedae48379efd59ab SHA-1: db81f8aa411135dd1c7ad7cdfeb4085c1c710d7f SHA-256: 49d48ad779054d568a5bd8c7c67699106cc5da1f7b0e703fe84beb23559bebb1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL pointing to 'ponafet.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=exercicios+figuras+de+linguagem+pdf+8+ano
    • https://cdn-cms.f-static.net/uploads/4447465/normal_603b339996806.pdf
    • https://mebopezik.weebly.com/uploads/1/3/4/7/134772208/wedufe-levutu.pdf
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/wejugitav.pdf
    • https://cdn-cms.f-static.net/uploads/4393791/normal_60568a014f439.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/6dee11d.pdf
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/1162893.pdf
    • https://cdn-cms.f-static.net/uploads/4454825/normal_60366d79dbb3a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuliwisuwig/how_to_clean_a_sub_zero_ice_maker.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/ethical_issues_in_psychological_assessment_ppt.pdf
    • https://uploads.strikinglycdn.com/files/76727409-8008-4c2f-ac56-850d1169f47f/fomewiset.pdf
    • https://s3.amazonaws.com/rekawexuretowo/traffic_reports_near_me_now.pdf
    • https://uploads.strikinglycdn.com/files/34906a73-95ae-4045-9c84-293dcb4a0acf/how_long_to_charge_kindle_paperwhite.pdf
    • https://s3.amazonaws.com/wuxupewu/the_vampire_diaries_season_8_episode_11_bg_audio.pdf
    • https://s3.amazonaws.com/loneminovu/41549910206.pdf
    • https://s3.amazonaws.com/dazutun/42331600348.pdf
    • https://s3.amazonaws.com/xepululejiwof/how_to_reset_a_verizon_lg_phone.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_off0000e191.bin
76eb1d9431a782438582e67afbaa6d921f794c3b218fb67dfb79729b49bab536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 5696 bytes
font_01_sfnt_off0000f4e8.bin
bb82960b18da4ab3d18151e6bf6cd670896e81486720f58b3418c822e12b6f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 12892 bytes

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