Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b80f56c41973b1…

MALICIOUS

PDF

87.5 KB Created: 2021-02-16 08:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 148b411023955d63363e3c5e696e2de2 SHA-1: fb3910e83f9f03bbd76f02ae57ff246aaee02e68 SHA-256: 50b80f56c41973b106379fd62533d9ef49dfd5fb751c5564a51cab6ec9a97b04
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the phishing or distribution vector.

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 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
  • 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://baarspo.ru/wb?keyword=what%20photo%20books%20are%20the%20best PDF link annotation
    • https://cdn.sqhk.co/volumusigu/hgggcid/pekobugewulojemizibakolo.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/3e5199fe60857.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/fv7yCid/dobivagutiwu.pdfIn PDF document text
    • http://pitushok.fun/xipaguzemolezevadi4nd32.pdfIn PDF document text
    • http://idealicait.site/62003464760ceeez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_6016fb2aa597c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5ffc64e74c5ae.pdfIn PDF document text
    • http://scandisvet.ru/merchants_national_bank_logan_ohio_phone_numbergnebs.pdfIn PDF document text
    • http://psylath.com/fufizitevetiwadujoxawoj4p4bk.pdfIn PDF document text
    • http://tehnotop.space/hubspot_inbound_certification_answers4x07l.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/hcghglf/toilet_starts_running_randomly.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/9464897.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/chjgdEw/vstep_ship_simulator_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd3511c32e3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roweviwumi.epizy.com/wakis.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/zonenalodatejizipifi.pdfIn PDF document text
    • http://ruvaseravijuged.rf.gd/complete_university_guide_2019_release_date.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_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 5092 bytes
SHA-256: 904cf5ffaf2ecd0d62984929c222290dc4ecff02e18c4e1b62a3c72626a7fd24
font_01_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 10628 bytes
SHA-256: 9b0d119370e2e254678d79966995e29b2938ff47bd1347182cd026632ad5ca90

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