Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72437f839d0f83a…

MALICIOUS

PDF

59.8 KB Created: 2021-06-10 03:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9edc47ce164a3a810964d6860a1e4bfb SHA-1: 409290850245a56a3db6fb8755eeb646ccf0d400 SHA-256: b72437f839d0f83ac49774b62eb91808c1993baa9899b7e61e048a663de0975d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded URLs suggest a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8996

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.
  • 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://cructi.ru/pbw?utm_term=piano+havana+notes PDF link annotation
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/3212857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_603c6ff29ecd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_5fdaf64a9026e.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/taxivefurogawi-rofobijuvofidim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6054b94020ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6022a0b9e247a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_6034997e9a974.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4447877/normal_60b2513c93051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_6006dc3b01aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5febc24226119.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/8883873.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/zapazopemoxebopasaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459320/normal_605211221ee33.pdfIn PDF document text
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/2286875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144414783/real_book_bass_clef_free.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/xibameradumavekimunogezu.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144572340/dabilojawitokobabudabus.pdfIn PDF document text
    • http://pewexojazo.pbworks.com/w/file/fetch/144876957/sticta_materia_medica.pdfIn PDF document text
    • http://suniger.pbworks.com/w/file/fetch/144570744/69619101187.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/f/royal_navy_doctor_pay_scale.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 4708 bytes
SHA-256: b9dd20349790d2650dcb7160a99195e1d356751ebe4e118d224d241b697366d6

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