Malicious PDF — malware analysis report

Static analysis result for SHA-256 c237abd2bd7b0d85…

MALICIOUS

PDF

75.1 KB Created: 2020-11-17 18:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33b505fa4e65060f61be816dc2845eda SHA-1: e48a0871375ef575e15fa8530a27301cca4d8bdd SHA-256: c237abd2bd7b0d85ed6b4feb2e23d08d3fce88c8bb1eb2151a9f052e2ecc1e56
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=fear+of+flying+erica+jong+amazon In PDF document text
    • https://jusegopij.weebly.com/uploads/1/3/4/4/134480833/cd5779f7510.pdfIn PDF document text
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/3616967.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/f07fade9a05da5.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/mufavod.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/wejalixex/frank_sinatra_jingle_bells_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/census_advert_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/nirebobaxelegemelapinuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d2249d-c4fa-4c31-8ec5-6b81d3d380b6/judato.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/60721872933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b29e021-0aa5-4353-a0b6-cf6440e7705a/jose_emilio_pacheco_el_principio_del_placer.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/mathieu_deflem_sociology_of_law.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/92568152583.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/57419500856.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/tiwalujutebuverov.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 5208 bytes
SHA-256: ccb55defddc8652478e5a6707f775b63c816a0ebd647be09a6d5826560a17833
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 11876 bytes
SHA-256: fa0d3af0943e9dfff9370bd8d2e1fcc8cea5b5cedf39f23e888c1354f488041c

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