Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f2c1b08c7411a4…

MALICIOUS

PDF

86.1 KB Created: 2021-02-18 18:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 847e1ee6b02e3cc7f18d96aa8b351ce1 SHA-1: ab0549847019574d608dab96ba7a134eb7e0a379 SHA-256: 29f2c1b08c7411a4a3407ef8cd410093d6bcdefa83f1b153f61054e919eec3fc
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 hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=how+to+use+hoover+power+scrub+spinscrub
    • https://cdn.sqhk.co/vazoguzo/f0Gjdgd/bounce_back_loan_scheme_end.pdf
    • https://cdn.sqhk.co/rovifatira/Oiajeu5/vivatibegifuwebiv.pdf
    • http://nuzenupezebep.iblogger.org/23711072754.pdf
    • http://zutixononazetu.iblogger.org/aitt_marksheet_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5ff067e3a28d7.pdf
    • https://cdn-cms.f-static.net/uploads/4468814/normal_600ae5ac26940.pdf
    • http://nusamovepi.22web.org/arm_cortex_r52_technical_reference_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://duvexarido.epizy.com/navigation_bar_android_apk.pdf
    • http://mubepagowo.rf.gd/tidujofot.pdf
    • http://vonizevugopu.rf.gd/badrinath_ki_dulhania_full_movie_filmyhit.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/new_bls_guidelines_2019.pdf
    • https://s3.amazonaws.com/vavabi/cotton_inkjet_fabric_sheets.pdf
    • http://regigaxuwejizu.epizy.com/57938266835.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/choriocarcinoma_and_malignant_hydatidiform_mole.pdf
    • http://fasokefukolu.epizy.com/across_international_vacuum_pump_manual.pdf
    • http://ratudafoxivux.rf.gd/google_forms_templates_free.pdf
    • http://bupikizatigog.rf.gd/cc_and_bcc_full_form_in_mail.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed08.bin
70dd15aa1b7d7dfc56b003e6c38f4e3938ca664860dc6a045a81348b7903f5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 4912 bytes
font_01_sfnt_off0000fdc8.bin
eb50fe3a469e519cc3c852b40425ace35cc643f4bf98ea6fc0beb40dd5f4cde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 12216 bytes
font_02_sfnt_off000126ea.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 16312 bytes
font_03_sfnt_off00013c75.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 4324 bytes

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