Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05c46779a80feaa…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 12:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d65dabd4b38ffc316b0d6bec6540000 SHA-1: 11ee5c72f6883d98bfad8c1e9134de2f1b5a5b72 SHA-256: c05c46779a80feaa818545860b09f4f0645177d31b631ef7714caaefbc6ea9c0
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=list+of+all+african+countries+pdf PDF link annotation
    • http://appless.space/flatland_edwin_abbott_freezfudn.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/hhia4jb/skater_girl_aesthetic_2020.pdfIn PDF document text
    • http://tehnikator.ru/how_to_tone_up_legs_in_2_weeksqneic.pdfIn PDF document text
    • http://sarerokedatijaw.22web.org/86182293508.pdfIn PDF document text
    • http://akb54.ru/how_to_connect_my_masterbuilt_smoker_bluetoothzrvzj.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/ZWTBigi/33440710101.pdfIn PDF document text
    • http://findssldz.xyz/99518325073ekomc.pdfIn PDF document text
    • http://rumagadoli.22web.org/kujosigaravi.pdfIn PDF document text
    • http://keto-menu.online/xizozamexemonaelgf4.pdfIn PDF document text
    • http://5-euro.info/the_ecology_of_human_developmentndhxc.pdfIn PDF document text
    • http://7lessons.website/cait_fallout_4_voicepu1jx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20da24e-9ab6-4f19-8a4f-289ffcb9c17a/rebakobutogaj.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_5b9159049226455d8063b6c09ca6d96e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d74222-88ee-40e6-af0e-e63dfcd2534d/value_education_notes_in_tamil.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_6b16fc4697184e44a4c24f33b6e582fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a84227-36f0-4710-be63-f52994e8c855/26852815893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0dd7a3-e19c-4055-87e4-ace6072f942c/microeconomics_class_11_ncert_book_download.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_e5624300b24d46f4a75672d1de7f00ca.pdf?index=trueIn PDF document text
    • http://jufebiwewizeza.rf.gd/31925295073.pdfIn PDF document text
    • http://zoletiwosi.rf.gd/bhutanese_latest_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a53fdf-157d-42c9-bd32-7783e1776281/94630406582.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_f578fd5e4cbe4dedb4768b12b578034b.pdf?index=trueIn 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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5092 bytes
SHA-256: 493c34a3490d402702852e68c859ba1d6490cdcae8144dc6c60371c73e7674e3
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 11268 bytes
SHA-256: 9f60a07bba1b11b583693999f24d3c5f8ef60a267aa9b24bf62ce1adb1aa8da3