Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1f436481a8bb5b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 16:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b70a4cb3aa55a103591608ffdf737f3c SHA-1: 54383e834ab10898921e7a8f150be7993a5c4d0a SHA-256: bf1f436481a8bb5baafebb7e9d0dfc3e1d3779524fb51279b7ae83ddb5e4eb00
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'assessment of cognitive learning'.

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://jottigo.ru/award?keyword=assessment+of+cognitive+learning+pdf PDF link annotation
    • https://cdn.sqhk.co/vusopukov/ijjh7ic/zolefawolirufovofifefida.pdfIn PDF document text
    • http://hurleyshamburgers.com/audacity_full_32_bit2lgul.pdfIn PDF document text
    • http://9gusevshop.space/xakipufosupoba8n4p6.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/51266407915.pdfIn PDF document text
    • https://vekukedabil.weebly.com/uploads/1/3/4/7/134710008/3947806.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/3e05c9d4.pdfIn PDF document text
    • https://kazamudadi.weebly.com/uploads/1/3/0/7/130775411/kemebimal_vatoxilege_fujajufefovij_sekix.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/popalubovulosomif.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/h1lMlRK/40974609088.pdfIn PDF document text
    • http://cheatyou.site/xasapinazufobilarigaka3azs2.pdfIn PDF document text
    • http://mnclassis.org/wulisozeguvuzudtqfvq.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/gA5jbJR/cannon_shooter_motive.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/26414746741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipagepe.atwebpages.com/pevotowibopimofoxokezufuv.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/42337142930.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/60538237648.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/what_is_a_frozen_lake_called.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5524 bytes
SHA-256: baffe5de632dd6fcec0143c79d96326032e9e2d8c29def2dbdd171b66715e90a
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10924 bytes
SHA-256: c74fa3ae98614a4bc0635ddfc7ca58a2f83045efe5927c159905d181f9d07986

Open this report in the interactive analyzer, or submit your own file for analysis.