Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd5aef0bf647659…

MALICIOUS

PDF

92.9 KB Created: 2021-04-07 23:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd3dbcc4f84dde056f5de5f974253790 SHA-1: dc142215c9ce584163b4c1c2d04a4f09ed0ab7f7 SHA-256: 8cd5aef0bf6476592c6d50d3c0351b51283a5ffc5a2a5ed2f8420a8956e40ab0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one URL specifically pointing to a phishing-related domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/123?utm_term=albert+camus+la+peste+pdf
    • http://koxenatez.22web.org/dubai_metro_map_deutsch.pdf
    • http://rijalebegag.iblogger.org/tylenol_500_mg_bula.pdf
    • http://savadaqwe.space/integrated_chinese_textbook_level_13upw5.pdf
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/c92468c.pdf
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/37439597b5e3d1.pdf
    • https://wezusewowanura.weebly.com/uploads/1/3/4/2/134235680/133e3625.pdf
    • http://blacktea.space/palladio_sheet_music_violinlhvft.pdf
    • http://rorixuge.iblogger.org/pdf_attachment_in_mailchimp.pdf
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/6018885.pdf
    • http://tizezs.xyz/dynamic_figure_drawing_free_downloadaib24.pdf
    • http://ttttrrrr.space/vawasuwusupitagasomiboxe4vha.pdf
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/1faa6.pdf
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/1727375.pdf
    • http://summ-green.fun/text_photo_collage_maker_app_downloadw9wwn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_de6b12c1f3294f008d1392a23cf1a981.pdf?index=true
    • http://mosokiwilag.rf.gd/docstring_python_format.pdf
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_b281f82a74124045a51d45572d2843fb.pdf?index=true
    • http://muxajetolalet.epizy.com/62412519788.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122ae.bin
52b63259e4ebfa54c2359c51e72c7830951407602e258770043306dbfc6da37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 5048 bytes
font_01_sfnt_off000133d2.bin
d6dec35633e7c4fe68662bb780529253085924879bc8e8c5d63b91361f022e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 11056 bytes
font_02_sfnt_off000158b0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158B0 4324 bytes

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