Malicious PDF — malware analysis report

Static analysis result for SHA-256 2023b73e0e7607f9…

MALICIOUS

PDF

67.4 KB Created: 2021-02-12 20:13:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 63485c38217daa8997dc5e9f8a065b26 SHA-1: 0bc6eccf7439a321df0f6b4e735176e4b770fbbb SHA-256: 2023b73e0e7607f94652358f173fc7e55f99bb06000dc18cfdd3c797905a62ab
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of these links, https://jottigo.ru/123?utm_term=unit+3+test+the+industrial+revolution, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources. No scripts were extracted, but the overall structure suggests a malicious document designed to redirect users.

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 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://jottigo.ru/123?utm_term=unit+3+test+the+industrial+revolution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428054/normal_60145dc4acda9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_6002a72e2f592.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/suxazademeguf.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/igCfjjX/52801595236.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/hbFicii/microsoft_to_do_list_app_office_365.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/jcSid1x/snowflake_ipo_price.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/dazawevokosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6021a9cac7be0.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/hgMTiaK/the_walking_dead_season_10_season_finale_date.pdfIn PDF document text
    • https://cdn.sqhk.co/tepobugu/ibghifx/74900484174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kuxuxemu/43097287306.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/xexarevaduxakovale.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/tuxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/fadimezatuvevevekawunetib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 5008 bytes
SHA-256: fa589ec0d85920b77da5766e5bfbe90ac0ce291eaa8457290e9982ff15928263
font_01_sfnt_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 9632 bytes
SHA-256: ac77215725eb4c65d7d51257424fd8c545f7f40d4c15c41761d64ce9c4ab6fac
font_02_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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