Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335a3c1ae8b76a1…

MALICIOUS

PDF

74.1 KB Created: 2021-06-08 06:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fade24ec14d4c460fbf7c82413cb5955 SHA-1: cf0cc8cdce0db6abca3d91845f6dda785eeb2924 SHA-256: 0335a3c1ae8b76a1ae2770bc2bf394a7273eb470dc0b2c5a7c2042961b28a202
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=excel+dashboard+templates+for+production'. This URL is presented in a context suggesting it is a lure for Excel dashboard templates, indicating a phishing or social engineering attack. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF is sufficient to infer a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=excel+dashboard+templates+for+production
    • https://cdn-cms.f-static.net/uploads/4371014/normal_606211ea51223.pdf
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5ffcaad7c0240.pdf
    • https://cdn-cms.f-static.net/uploads/4462980/normal_6041820ce3c8e.pdf
    • https://static.s123-cdn-static.com/uploads/4419849/normal_5fe1c3121e0d8.pdf
    • https://cdn-cms.f-static.net/uploads/4466413/normal_600f57abe36da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bupataved.pbworks.com/w/file/fetch/144419772/les_alphas_livre_du_maitre.pdf
    • https://uploads.strikinglycdn.com/files/7c413568-5424-4634-8d59-8b7263392332/pioneer_vsx-44_manual.pdf
    • http://pewudomame.pbworks.com/f/48176713985.pdf
    • http://jopamedet.pbworks.com/w/file/fetch/144701016/videobuddy_apk_download_2020_for_pc.pdf
    • http://zetewufor.pbworks.com/f/trumpet_tune_piano_sheet_music.pdf
    • http://nenikobowon.pbworks.com/f/what_are_the_three_levels_of_personality.pdf
    • http://letonepamusi.pbworks.com/f/45849733965.pdf
    • http://zikasamu.pbworks.com/f/asme_b31.8_2018_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fa9c4140-ab31-446c-94ac-7c2ba3648d10/easy_guitar_chords_songs_2020.pdf
    • https://uploads.strikinglycdn.com/files/9d76de8f-d81d-4ba9-8d26-10757b97a235/asphalt_8_airborne_token_hack_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/8e39273e-51fc-4500-95cd-f31687ff3735/which_obd_scanner_is_best_for_bmw.pdf
    • http://bizogug.pbworks.com/w/file/fetch/144761625/how_accurate_is_clear_blue_early_detection_pregnancy_test.pdf
    • http://gulisapil.pbworks.com/f/xurexosuwe.pdf
    • https://uploads.strikinglycdn.com/files/eca5c99f-9b50-40a4-bdeb-3205a88069af/what_kind_of_cell_is_osmosis_jones.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_off0000e313.bin
9aa144460d95501e0f6dded9c66b3f7cf2b71313eae375832fc761fe54bb0531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 5560 bytes
font_01_sfnt_off0000f5ce.bin
83d23389c4bc89bdd8223efbd237eb82a7c2ed465ae190d37b71cb6d001831c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10936 bytes

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