Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4325b7555ef3b1…

MALICIOUS

PDF

76.9 KB Created: 2021-01-26 08:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 38ee07c5407f47e857d5cf81ac8ca7c5 SHA-1: 850eaf91974c6fc146f24062f395c42b8d9d4d18 SHA-256: 4d4325b7555ef3b1ca4668da81a3ecacb2bff3030494ecf3a69cf3a2ce1b20bd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating redirection to known malicious infrastructure and a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. The document body is heavily obfuscated and unreadable, but the presence of malicious links suggests an attempt to lure users to external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=alan+harrington+the+immortalist+pdf In PDF document text
    • http://polokuvek.iblogger.org/41253507574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd9616ecc22a.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/hiM8Wjw/color_pop_effects_photo_editor_free_color_lab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_600665f95009f.pdfIn PDF document text
    • http://jopalebifu.iblogger.org/japiruva.pdfIn PDF document text
    • http://espaceabone.com/game_maker_3d_model_creator80i68.pdfIn PDF document text
    • http://bogavevi.22web.org/adjoint_of_an_operator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369158/normal_5fd05bec2ee62.pdfIn PDF document text
    • http://afracheat3.xyz/missiles_meaning_in_odiasnpau.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://menimilerawapo.rf.gd/70953287205.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/trade_account_form_template.pdfIn PDF document text
    • http://pifutujotot.epizy.com/annette_king_s_raid_guide.pdfIn PDF document text
    • http://mipuberepe.epizy.com/97807731680.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/69390745822.pdfIn PDF document text
    • http://mawarine.epizy.com/rozivemovuxezub.pdfIn PDF document text
    • http://kojajopi.epizy.com/motionless_in_white_voices_free.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/a_new_beginning_with_god.pdfIn PDF document text
    • http://torumaxot.rf.gd/how_many_excel_worksheets_in_one_workbook.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5232 bytes
SHA-256: 7a2794a20c3a590ab06e3449d5e5076c00cbed8a416e47f68589b5be4490974c
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 10328 bytes
SHA-256: 6a6d1fcdd458749d9e0edfcba2ab5555f0ea23dede25c1c832dd6b112430e547
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.