Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6524b365a65fd5c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-25 14:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b3b26e27349bd1b156974e9cba75de3a SHA-1: 5a9108a686c02a90b7d8f57780c256aabd9cf6f8 SHA-256: a6524b365a65fd5c3eb3ec334be08ce229ed6b26ca767a4faa335a9302e59a86
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

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://soxebez.ru/wix?keyword=australia+vs+bangladesh+live+cricket+streaming+hotstar PDF link annotation
    • http://rat-red.space/soal_dan_pembahasan_osn_biologi_smawkbew.pdfIn PDF document text
    • http://1yamal.space/android_browsing_history_will_not_clear0xn3t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475992/normal_6001814558324.pdfIn PDF document text
    • http://lessonsonline.site/42760196568aq568.pdfIn PDF document text
    • http://siankaanmexico.com/xidakuzabur2mntu.pdfIn PDF document text
    • http://axacheat4.xyz/34438206327z3dcx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ffca60e9cf9e.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bV6FiUM/nopetokanel.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/zalef_petofoxa_miwawaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5fef3f2d48153.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/f670230.pdfIn PDF document text
    • http://reduslimitaly.website/basic_emotions_word_search_answersi2r3b.pdfIn PDF document text
    • http://swast-group.website/85517537102kwua1.pdfIn PDF document text
    • http://qlemelest.online/sokiladareleluvowunexazle0n.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/3igg6BG/4223947691.pdfIn PDF document text
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/juner.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/jajhihp/duck_donuts_nj_green_brook.pdfIn PDF document text
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/juritaw-sakogiva.pdfIn PDF document text
    • http://andyhongdigital.com/how_to_charge_karecel_hand_warmerbaovq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 5608 bytes
SHA-256: c1a9969227df558f342d5347cbe9008fc90d82743d3da2fd756be91b1cf5da5a
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 11168 bytes
SHA-256: c70b3973316ceec7019a9e0925606e0e44bf9f66e74c2e852a9aee677ecc0f62

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