Malicious PDF — malware analysis report

Static analysis result for SHA-256 a477dcf14072d7c7…

MALICIOUS

PDF

65.6 KB Created: 2021-03-18 12:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b0ae8b25e6aa7dae28b0ccff7772ca9 SHA-1: 0e6ea51998235637c3a501effd3003295887e8de SHA-256: a477dcf14072d7c7c50d0402b8aa739f493b39db6ca32d1ddf2734a69ce7d124
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'feedback mechanisms pogil answers', indicating a lure to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://resalured.ru/wix?keyword=feedback+mechanisms+pogil+answers
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/tebizukidide.pdf
    • https://cdn.sqhk.co/terodekijur/jigOJMY/audio_pro_addon_a40_multiroom_test.pdf
    • https://cdn.sqhk.co/talokelom/c833zib/dolufuma.pdf
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/solujevomufiga.pdf
    • https://rurezakofone.weebly.com/uploads/1/3/1/1/131163981/c98a475a.pdf
    • http://nevogixire.22web.org/cardiac_ppt_template_free.pdf
    • https://maxamiboxu.weebly.com/uploads/1/3/1/6/131607029/gexot-fobimuwitoronu.pdf
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/5360923.pdf
    • https://mapaluloxusogor.weebly.com/uploads/1/3/0/7/130739646/bce265dde99a690.pdf
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/7199252.pdf
    • https://cdn-cms.f-static.net/uploads/4500665/normal_6045647495e49.pdf
    • https://cdn-cms.f-static.net/uploads/4384295/normal_60243c6fdc23f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wegudewabeko.rf.gd/77021875434.pdf
    • http://veruzixiki.rf.gd/kixedabadezofa.pdf
    • http://jefelaxe.epizy.com/ftb_extreme_reactors_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c515.bin
589d7defa1f40ed59f54fa89d9c091e638a6206b15758d7d20c5117648dcdfda
pdf-font-stream PDF embedded font (sfnt) at offset 0xC515 5736 bytes
font_01_sfnt_off0000d882.bin
38c7727295a3d80586599c46494a9bacbe727c0c71d4bcffc551b463ebcbeceb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 9788 bytes