Malicious PDF — malware analysis report

Static analysis result for SHA-256 03335920f6f415f3…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 19:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 818c98f196334a3d5d102285e6b8e129 SHA-1: f5378fc0ff684c22483005b2c8afa47aadb92c79 SHA-256: 03335920f6f415f3cd4aafe40627235a5aa473b96629f8806a361869c37be028
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for a movie, which aligns with the phishing nature of the detected URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=perfume+the+story+of+a+murderer+full+movie+online+free In PDF document text
    • http://characduwe.space/28500384131387ql.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_600885f17c6b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371505/normal_5fde9a8459040.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/24d51918b64c4.pdfIn PDF document text
    • https://fefoxotavom.weebly.com/uploads/1/3/5/3/135328849/kenajotone.pdfIn PDF document text
    • http://mosasekoz.22web.org/81228724094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_600a10fe892fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fd980c454b64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_600901db18a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_6025c1907fa05.pdfIn PDF document text
    • http://stavki.link/57329262817lyvz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokiralasido.epizy.com/jinitiboxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/auto_tune_voice_app.pdfIn PDF document text
    • http://zejenideve.rf.gd/logo_design_software_free_download_full_version_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/army_lu_cho_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/adverbial_phrase_worksheet_with_answers.pdfIn PDF document text
    • http://powajokex.rf.gd/adjective_vs_adverb_worksheets.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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 5312 bytes
SHA-256: bc0486da8f20aaa6ba34bc340611d47f0a6f4c46e44ce06da54599ab845c0498
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10980 bytes
SHA-256: 4f2e1e2b292e3a30e4c2b5813b4c6597e04deb110561d97bbf1cc926c5d4d50c

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