Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f906d9ee52ad86…

MALICIOUS

PDF

92.1 KB Created: 2021-02-19 05:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 409ea88a444d7d223056f4b3dcfccc6b SHA-1: eda85bbbb40b31319f2e264c859df51523002a66 SHA-256: 90f906d9ee52ad8624cd5d76fb1f7b7c58bbc2bd9777f9e2dc8ef748f45c0932
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of links. One of the primary URLs, 'https://jacksth.ru/123?utm_term=what+are+intellectual+developmental+disabilities', suggests a potential phishing or SEO manipulation attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous external links points towards a malicious intent to redirect the user.

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://jacksth.ru/123?utm_term=what+are+intellectual+developmental+disabilities PDF link annotation
    • https://cdn.sqhk.co/xolovagi/jgeQjdf/darufexakopusimatizilo.pdfIn PDF document text
    • http://tesevamomavuruf.22web.org/fuvagokone.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/cETip2p/fgteev_soundboard_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ghYigji/btd6_dartling_gun_mod.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/6982011.pdfIn PDF document text
    • http://dikiwezuvejeve.iblogger.org/only_connect_wall_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/ifhhibQ/riselafevamulonu.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/mokojufiwubu_jowabigolobapo.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/sefabe/arjun_telugu_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/son_altesse_srnissime.pdfIn PDF document text
    • http://dofavopuberobot.epizy.com/code_vein_gift_exchange_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/potentiality_and_actuality.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/bed_bug_report_cancun_mexico.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/lisot.pdfIn PDF document text
    • http://torexogisodejez.epizy.com/lab_report_14_skull.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/kadamban_2017_tamil_movie_free.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_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 5524 bytes
SHA-256: b6ecd32694e6f452365a2e4fa15688c8da6cd5d6dc0f007c03e61a6f8f0673ea
font_01_sfnt_off00013d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D51 11148 bytes
SHA-256: 8079571c8bb931e335dcb5a26d3f3faa37ca7b5f56a3afe943e4d9ab82f44f5e

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