Malicious PDF — malware analysis report

Static analysis result for SHA-256 3124746e3eb25b03…

MALICIOUS

PDF

62.2 KB Created: 2020-12-22 23:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 555916f6229810089da800087a53e280 SHA-1: 676684abe609b150b551cdfd8e1b714290364755 SHA-256: 3124746e3eb25b03ae849a152db4d71dbc982d94ffeb3b501e4b9cb53d49b459
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=zombie+assault+2+apk'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://s3.amazonaws.com/dejazuvorira/duziroxumewuzajuro.pdf'. The ML classifier also flagged this PDF with a high probability of being malicious. No scripts were extracted, but the presence of malicious URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=zombie+assault+2+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368984/normal_5fcbf0038d495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5fd35828d5e51.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/9093774.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/dejazuvorira/duziroxumewuzajuro.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37885b7bc966055e0d98/t/5fde53052da99c2868184daf/1608405766011/algebra_1_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/kimepi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce353649d01c20c204e848/t/5fd73a215488895576c69fdc/1607940641177/o_bahana_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/fortinet_ssl_vpn_setup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/the_beatles_bass_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/semilakiwupazokez.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6592ae9fc3622d5471997/t/5fd6f65eab1a676c72a39277/1607923297003/podadoras_de_pasto_manuales_usadas.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/69611469437.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe13ce6b9c87d07fa023544/t/5fe15c2a2eddad3b374d9feb/1608604714693/zoniretazodu.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/23159462349.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/aptoide_apk_ios_ipad.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_off0000b5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C5 5164 bytes
SHA-256: 23465da267675f6a74e107aab34e0640e8f231d7b3417cc80709bf82ef8d2bfc
font_01_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 10360 bytes
SHA-256: 3b254647ea78271ee7a78f42875d49b0556c8434bf12c8e77ab65eb2e2875094

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