Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd7f8d8b9648c28…

MALICIOUS

PDF

70.7 KB Created: 2021-03-29 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 752dc093539eb3af2d271a1addecbe6a SHA-1: eec90448cfed482ddd8adea4e3b5bc2c4368ff7d SHA-256: 1bd7f8d8b9648c28b1e820399245362c2be40280c190ae674fac7e4c298f4f8b
184 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8612

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/award?keyword=assembling+california+john+mcphee+pdf PDF link annotation
    • http://mujakomafadumuz.iblogger.org/battery_tender_junior_800.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/galixupage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fdaf0a14010b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_600fc3b5594be.pdfIn PDF document text
    • https://mazomolorir.weebly.com/uploads/1/3/2/6/132682829/299948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_60348557094a6.pdfIn PDF document text
    • http://wofonefa.iblogger.org/15275835606.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/sakukipipolonat.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/1fb9e.pdfIn PDF document text
    • https://vejefipilarof.weebly.com/uploads/1/3/4/6/134663014/kuworinufizinur-fugeteguduj-mutalibiradojet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_6034600e8f113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_c815de1da8454532bd643a1cbebeced1.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7d60d586912a4363b62a4230ef0a1cb0.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_551a241f5156458692321f337cbaf02a.pdf?index=trueIn PDF document text
    • http://fudogupadi.rf.gd/magisterium_3_espaol_descargar.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_d64b8ff60ba7444b90afc778235e1b39.pdf?index=trueIn PDF document text
    • http://galexuduxegi.epizy.com/24103410838.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_6a171890ccc14a269c181218739ad89b.pdf?index=trueIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_50041c0acbd84637b4ddfaebebf1deeb.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_c8003e8ac7b240d29a9e441b496254cb.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 5772 bytes
SHA-256: d484bb17966d3dd90725f4b48654d28385ec27432ba7f4f86ee9e5069fc08487

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