Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61c156f82756ad8…

MALICIOUS

PDF

71.5 KB Created: 2021-01-23 01:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a316aba2cd4df88384e2129ee1991cb3 SHA-1: 787e592024b02044525f103ee0eea83ca87121ac SHA-256: e61c156f82756ad843f786f56fac059f7c4a1afa57f24bd35d8c13cde977a000
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or subdomains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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 https://crophysi.ru/aws?utm_term=cara+membuat+kuesioner+di+google+form+2018 PDF link annotation
    • https://site-1168209.mozfiles.com/files/1168209/67253284730.pdfIn PDF document text
    • https://site-1178567.mozfiles.com/files/1178567/zenajuresovoleg.pdfIn PDF document text
    • https://site-1173371.mozfiles.com/files/1173371/pinusepuvaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fd039c12e824.pdfIn PDF document text
    • http://rafewasugajeze.22web.org/41205396709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_5ff3144d9830d.pdfIn PDF document text
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/juzuv.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/dulavupus.pdfIn PDF document text
    • https://site-1200268.mozfiles.com/files/1200268/solinca_oeiras_mapa_de_aulas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fcc290c71d54.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/9640987.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/d418e.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/xisakazelelinim/apps_anonytun_achi.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/lamborghini_song_free_pagalworld.pdfIn PDF document text
    • http://jotikovan.rf.gd/94642079889.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/messenger_apk_mod_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/donjon_et_dragon_guide_du_maitre.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/dakukumagegil.pdfIn PDF document text
    • http://birijigasexow.epizy.com/65706663094.pdfIn PDF document text
    • http://vukigopi.rf.gd/adjective_worksheet_for_class_5th.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/casey_neistat_music_free.pdfIn PDF document text
    • http://sefatefa.epizy.com/figure_legend_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/explain_the_principles_of_effective_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/cisco_firepower_1120_installation_guide.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 5856 bytes
SHA-256: 8809c767de23bcf53884442b61e4baae0acf947bde917dd96c60f79686eb672d
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10904 bytes
SHA-256: e094999cade216dbad8041d2ad07c72dce2e14ec6f3feddb8cd0dc09fff09117