Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97a8aabded67a2c…

MALICIOUS

PDF

88.4 KB Created: 2021-02-08 17:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 73afeeae2c7fece93faf5f6b0e9f8a88 SHA-1: 1c7db7257396190a8502d72d2f97657578edb331 SHA-256: a97a8aabded67a2c691d786a6dbe9d47d795ad14ebff83f583cf3d5f8a5e00ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though partially corrupted, references 'Hipertexto definicion informatica', suggesting a lure. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=hipertexto+definicion+informatica PDF link annotation
    • http://wedavinonuvovu.22web.org/7562793535.pdfIn PDF document text
    • https://dotomogef.weebly.com/uploads/1/3/4/7/134760479/abda3ed38af.pdfIn PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/ea0d23122c81fa4.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/48275758115.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/clearance_certificate_form.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://dadorisisewane.epizy.com/gangster_paradise_movie.pdfIn PDF document text
    • http://garulolit.rf.gd/3634777123.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/65571707741.pdfIn PDF document text
    • http://doroxokile.epizy.com/wilson_bureaucracy.pdfIn PDF document text
    • http://zowuxepalaget.epizy.com/first_engineering_notebook_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/kutty_movies_2019_kgf.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/chadariya_jhini_re_jhini_remix_song.pdfIn PDF document text
    • http://disobaratid.rf.gd/birchwood_vale_school_uniform.pdfIn PDF document text
    • http://zepaxawom.rf.gd/kavazawukevufesulepal.pdfIn PDF document text
    • http://gujomodezeroj.epizy.com/zibukanowaraxow.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_off00010f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2C 4908 bytes
SHA-256: 456f342886a374ceef0580a52bf6935ec4e9e507492a33ec8ee258ce643ed1d3
font_01_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 11000 bytes
SHA-256: a42ea1e6be9cc9b51047134e128e664aa01de4ede0251af7be306297d04c4cca
font_02_sfnt_off000144b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2