Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a5eb2957bf4cc8…

MALICIOUS

PDF

39.8 KB Created: 2020-04-02 06:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31deb58ff02298254f74eac83b47cab2 SHA-1: 922071e000eb47f1c5c17ae37face519882e62e7 SHA-256: 41a5eb2957bf4cc85ab8cc720cb28c5587395ff394a7ae64512cf26136c9f2f3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs with numeric or slug-based filenames, indicative of a link farm or SEO abuse. The primary URL http://agpmav.com/uploads/1/3/0/5/130544687/130544687.html#imagenes+de+preposiciones+en+ingles+para+ni%C3%B1os suggests a lure related to English prepositions for children, which is likely a deceptive pretext. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that these links are intended for malicious purposes, such as redirecting users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://agpmav.com/uploads/1/3/0/5/130544687/130544687.html#imagenes+de+preposiciones+en+ingles+para+ni%C3%B1os
    • http://eliteequinedentistry.com/uploads/1/3/0/6/130620449/d1c016a2d4b6076.pdf
    • http://foxvalleyrestaurant.net/uploads/1/3/0/3/130312993/gozibazitutevi_zinobotef_wojufe.pdf
    • http://counselingwithstephanie.com/uploads/1/3/1/3/131380942/21a8b.pdf
    • http://betterworldbetterfuture.com/uploads/1/3/0/5/130539696/palafekurojaxi-mofutul-gusen-jurat.pdf
    • http://paths2careers.com/uploads/1/3/0/2/130289198/zakodusazomopoti.pdf
    • http://alissajacobscmt.com/uploads/1/3/0/5/130550769/wuratabubode_zawajoxutamad_jumuk_bawedofetise.pdf
    • http://rachelkaterose.com/uploads/1/3/0/6/130604309/1341430.pdf
    • http://neokundalini.org/uploads/1/3/0/8/130813366/cdcfbba5ad09.pdf
    • http://hetonderwijshuis.org/uploads/1/3/0/2/130289096/dijimixadefep-ludokoxuma.pdf
    • http://nemo4sale.com/uploads/1/3/1/4/131408465/5963453.pdf
    • http://swimleftlabs.com/uploads/1/3/0/6/130605238/7b274ae.pdf
    • http://maikudolee.com/uploads/1/3/0/7/130776314/kepujavasi.pdf
    • http://nebraskasolarschools.net/uploads/1/3/1/4/131437241/bodobutikejem_bododiwimo_fadozajuvinel_jokeliwixakuk.pdf
    • http://annmrenker.com/uploads/1/3/0/2/130272384/xozekabipirix_dotageluvefotek_pivebojusidoj_mifewosuxunagop.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e42.bin
d8319e11378510bf7cafd06fa6f133c7c39856665fb43c5a764ca8086dd4fe5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 9252 bytes