Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b44139b980091…

MALICIOUS

PDF

82.6 KB Created: 2021-02-08 19:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 603b4ad840135b1bd1df495637ca0e97 SHA-1: 76dc5a4ef15c331f53c5bb2f89a5f6c6a39378c6 SHA-256: 4f4b44139b98009137c8609127d947b7f5d3eb4f3a5a6ad54d3f153887e10a32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://jottigo.ru/aws?utm_term=android+8+easter+egg+empty+dish PDF link annotation
    • http://social-whisper.ru/pulmonary_hypertension_classification_guidelinesluqqk.pdfIn PDF document text
    • http://copyrightproblem.com/nefropatia_diabetica_fisiopatologia_20200mgt0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fced7a18e9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_5fe838ace313e.pdfIn PDF document text
    • http://policyhelpcenter.com/minecraft_1.8.0.8_silah_modue26ra.pdfIn PDF document text
    • http://particulieres-societegenerale.best/79053350284t1smq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fd1134a9cc12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_601d91d2b7a76.pdfIn PDF document text
    • http://uaportal.site/julius_caesar_testfz0ue.pdfIn PDF document text
    • http://ryduslim.website/levumeamlpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fe857782d525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5fd83a9caa9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6013594649dc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bisleri_fonzo_advertisement_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/roblox_shirt_template_white.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/roselive.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/44229389982.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_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 5628 bytes
SHA-256: 94ca6bf10c67a4428535f90ffa6b00df38e7ba7c12b43695ca3c9d60a16c6ce6
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 11536 bytes
SHA-256: 63ee9735054bf3edcf02f688bd5912eee7671446b6c0864fb2c0a9699c33a7f2

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