Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0a363e5fc35a68…

MALICIOUS

PDF

111.0 KB Created: 2021-02-20 05:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cc9373ff42f6f85cc7f7584c6122f467 SHA-1: a940a01265ae1fbd67c0346122a96a728e6e3b35 SHA-256: dd0a363e5fc35a689dd22400ceb35b0963999392ad44c19af6e88d78d5a2879f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary external URI pointing to a suspicious domain that appears to be part of a link farm designed to attract traffic. The document body, though heavily obfuscated, suggests a lure related to 'big data analysis companies in india'. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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://leonvi.ru/123?utm_term=big+data+analysis+companies+in+india PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377401/normal_602a2b27d93b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_601150f4ab7b3.pdfIn PDF document text
    • http://potusowo.22web.org/movember_moustache_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fdde1448ad79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_60069e4d99155.pdfIn PDF document text
    • https://xadularapiro.weebly.com/uploads/1/3/1/4/131437383/zozefakivepodomeke.pdfIn PDF document text
    • http://misiliv.66ghz.com/dogijasitixepabifujagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_60110ba9b9745.pdfIn PDF document text
    • http://sukujugonada.22web.org/bahubali_2_tamil_sad_ringtone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedakukabizo.epizy.com/how_to_read_index_futures.pdfIn PDF document text
    • http://sixexelotu.epizy.com/average_cyber_security_salary_in_india.pdfIn PDF document text
    • http://gonumarimemax.epizy.com/22192566550.pdfIn PDF document text
    • http://xafamikipu.epizy.com/57610261440.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/84517670574.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_off0001728f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728F 5448 bytes
SHA-256: 82eebcfb87b5b69869698e98f83e12e7ae1112def87428bd77c8b79de2af6a12
font_01_sfnt_off0001851b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851B 12440 bytes
SHA-256: eddb3c1a5fe3ca60f8574ef2bcd4ad62c205c0d8406345ea8de1dcf791110629

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