Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c99202f544b218…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 02:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c335655d4a6f69dd13dee49144d3f3dc SHA-1: b769325738fd909e22cbb6794db45ae615b70630 SHA-256: 56c99202f544b218598f63d9f6d472b5ccafe2ddb3d8fbdafa2366c042b17af4
136 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it's a phishing lure, specifically using an SEO redirector for a fake free download. The embedded URL, https://jottigo.ru/strik?utm_term=libro+11+minutos+de+paulo+coelho+pdf+gratis, is the primary indicator of this malicious activity. ClamAV also detected this file as Pdf.Phishing.Trojan.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=libro+11+minutos+de+paulo+coelho+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fc6db2be7513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc691c29b83b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5fe8f36b0933a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454301/normal_5fc6ad0c2b37b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fcac8c625d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_600f1ee2aaaef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_5fe77b1c1932d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fe4d9b7542b5.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/jjjdMjg/85537588373.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/iijMI1p/kosmos_helper_app_ios.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/wuwexagipiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_601bddcf36c71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5fd1cfb2135cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/grenada_lake_spillway_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/avery_dennison_supreme_wrapping_film_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/54449356069.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 5700 bytes
SHA-256: 7c0b4ded471e309f8274f47df3d654de85734b706dfb1b6e88003766d3859af1
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 11448 bytes
SHA-256: 384a85078b9846f1be5afafdee91e5e44df98c1e527b2700283238ba17e52e4e