Malicious PDF — malware analysis report

Static analysis result for SHA-256 f766887dbde057b8…

MALICIOUS

PDF

78.4 KB Created: 2021-01-21 21:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58860a67010c602919e59bfc8eec7379 SHA-1: 7c70bb410b67805e562c795eb4b57b39c472308a SHA-256: f766887dbde057b8a7d78d13c360f815e7421dcb3ed773134d01dc701b035f59
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful content.

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
  • 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://seumenha.ru/123?utm_term=fresh+coat+painting+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5ffbf68a3e0d2.pdfIn PDF document text
    • https://site-1175198.mozfiles.com/files/1175198/pizamuvuzidamewo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe14ff5e5559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_600154f5d494c.pdfIn PDF document text
    • https://site-1182082.mozfiles.com/files/1182082/pakudabinezugevisabi.pdfIn PDF document text
    • https://site-1179485.mozfiles.com/files/1179485/soap_cutting_videos_download.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/civil_war_generals_as_muppets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_5fe8ffd2339df.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/penudupokoriximu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juvegebufu.epizy.com/zosikikusu.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/calendrio_janeiro_2020.pdfIn PDF document text
    • http://desakoda.rf.gd/anemia_pregnancy_treatment_guidelines.pdfIn PDF document text
    • http://kobuxotaregudes.rf.gd/gazixosuzobe.pdfIn PDF document text
    • http://galapeb.epizy.com/61651704532.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/vitamin_b12_davis.pdfIn PDF document text
    • http://dixuzudes.epizy.com/81042136974.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/powerpoint_template_design.pdfIn PDF document text
    • http://wowinagapujepok.epizy.com/elementos_del_genero_dramatico.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5268 bytes
SHA-256: 0c9964f5d215ec2ee4ec5ccd0c8e8b6f5097a03ba25ce0fa8afc57daf4fefa01
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 11204 bytes
SHA-256: ffe360b5cbd9950f0288e4d1d4eee00ce93ac6b11a717f9a6d0758ae462a8305
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 16204 bytes
SHA-256: 95f2a8319533f051e584a9e2aa38e8d42f7eb419abe795cf0dce2d6390e2c0a0

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