Malicious PDF — malware analysis report

Static analysis result for SHA-256 204b8d99b120f892…

MALICIOUS

PDF

77.5 KB Created: 2021-02-13 21:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c9032ae391b5235888e5375be94ffd19 SHA-1: ac8596c7116d6010232a06c3630cf04de7d253f1 SHA-256: 204b8d99b120f892ac07d75f6647cf1512e84d80a65c6ae90d42d8f432e5f0d6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru' and disguised with a 'children's story' theme in the URL parameters. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious activity. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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
  • 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://bologen.ru/123?utm_term=the+children%2527s+story+by+james+clavell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601df342718e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/96Cuggc/43253734207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_602117ce6a36c.pdfIn PDF document text
    • http://quickstore.pro/hallelujah_piano_sheet_beginner7222l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380701/normal_5ffd5356b71c1.pdfIn PDF document text
    • http://leaninrzpd.site/49232049573hdffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fca5ebda97ba.pdfIn PDF document text
    • http://kigurumi.org/766798437400kkix.pdfIn PDF document text
    • http://shoop-ft.ru/9739878935gdj5q.pdfIn PDF document text
    • http://nelitip.22web.org/certificate_of_authenticity_template.pdfIn PDF document text
    • http://faceit.su/naruto_shippuden_mod_apk_unlimited_money3dtjl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5ff97f84e5c7d.pdfIn PDF document text
    • http://tersq.fun/o_sherawali_song_downloadd302h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mupefapakag.rf.gd/vivur.pdfIn PDF document text
    • http://dapodakek.rf.gd/lekatodasox.pdfIn PDF document text
    • http://sivopob.epizy.com/21685557226.pdfIn PDF document text
    • http://tajomum.epizy.com/76020285772.pdfIn PDF document text
    • http://wunozoviwo.epizy.com/wosumotilizezuzezuxarox.pdfIn PDF document text
    • http://jupasugego.rf.gd/adnoc_logo.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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5540 bytes
SHA-256: f66a358b785251ada08e8ac89f6bdaf397a19204de5cf3f1a1af637c5b25c817
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 10968 bytes
SHA-256: 38e94b03effafdc95da529f0bdc9df2b708e06a4339e056748ce1b302fc90a00

Open this report in the interactive analyzer, or submit your own file for analysis.