Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f01f91a65208ed0…

MALICIOUS

PDF

86.3 KB Created: 2021-03-20 02:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d87601ba74c9e7fc2346929b316949f SHA-1: d68f284eb47ecac5eb26c1907346eb7028b19e78 SHA-256: 4f01f91a65208ed058ab242c80151dc5b2226c5db30b3ce325c7a88b8c02de8b
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified by the PDF_URI heuristic. This URL, https://dafemum.ru/strik?utm_term=nietzsche+human+all+too+human+cambridge+pdf, is likely part of a phishing or social engineering attempt, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The document body, though heavily obfuscated, appears to reference the book title used in the URL, suggesting a lure to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=nietzsche+human+all+too+human+cambridge+pdf
    • http://beririka.scienceontheweb.net/how_to_thread_singer_301.pdf
    • https://cdn.sqhk.co/pugirunosamo/gg1ib8K/fivestars_topup_recharge_profile.pdf
    • https://cdn-cms.f-static.net/uploads/4411686/normal_60465ad47a775.pdf
    • https://cdn-cms.f-static.net/uploads/4473064/normal_60120871a67f5.pdf
    • https://cdn.sqhk.co/gilubibawi/5hdKOij/wuzetigaruzix.pdf
    • https://cdn.sqhk.co/kubemuzu/Lhihbhd/81473308654.pdf
    • https://cdn-cms.f-static.net/uploads/4383702/normal_604f764da473f.pdf
    • http://lotupojaxuvutix.mygamesonline.org/jidik.pdf
    • https://cdn.sqhk.co/fawabanof/igjhhjh/6861130452.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabom/my_singing_monsters_wublin_island_guide.pdf
    • https://s3.amazonaws.com/xapota/sepefuzi.pdf
    • https://uploads.strikinglycdn.com/files/280b2086-4b6d-44ea-b59d-229a8aca8cd1/bolapivu.pdf
    • https://s3.amazonaws.com/sefabe/tamil_christian_songs_masstamilan.pdf
    • https://uploads.strikinglycdn.com/files/fca73b8d-dc4e-440b-a60f-883dd088d81d/gubovokeboxojawitesizune.pdf
    • https://uploads.strikinglycdn.com/files/c457ee02-3d40-4be3-86e6-6f679f2cb28d/6167139367.pdf
    • https://s3.amazonaws.com/tafogusegabomu/95664289561.pdf
    • https://s3.amazonaws.com/legapatatezisa/abnormal_psychology_barlow_free.pdf
    • https://s3.amazonaws.com/dowavelaxam/miran.pdf
    • https://uploads.strikinglycdn.com/files/75f41c2a-a8f7-45bb-a5bc-6eb67874ce37/botojorowowobusekenowano.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_off0001116a.bin
caa5995fabc1e1f26bd14a770ac868c895feeff3cb46e73f0a9e0cda58951835
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 5728 bytes
font_01_sfnt_off000124c3.bin
9b33c47a3ab96b49a379274163c8e439e60a859853af35367fb0c93ce3851595
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 11960 bytes