Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b8af3d0cd35834…

MALICIOUS

PDF

77.9 KB Created: 2021-02-20 19:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 337ef755d670531b5c6c20f28e216533 SHA-1: 492f5144fe41779eb82e8a46f0a8500dee9f05c6 SHA-256: 48b8af3d0cd35834ce7e20cfc19dfa891925d13705caf7a44c087306f11dbe0e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=brandy+melville+los+angeles+sweatshirt'. This URL is likely part of a phishing campaign designed to trick users into visiting a malicious site. The ClamAV detection and ML classifier further support the malicious nature of this PDF, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=brandy+melville+los+angeles+sweatshirt In PDF document text
    • https://cdn.sqhk.co/zenekukera/gVAhfie/supajedajazuz.pdfIn PDF document text
    • http://shtangye.xyz/zevejokao9rwi.pdfIn PDF document text
    • http://hargotel.xyz/solid_bhola_song_videoiy3wp.pdfIn PDF document text
    • http://shoppingyxplus.xyz/40529512610obgri.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/djbjijg/lugewobebuvi.pdfIn PDF document text
    • http://ijmalan.xyz/goxijiredetizaxixiiw716.pdfIn PDF document text
    • http://salet.store/tiberian_sun_windows_10j8d10.pdfIn PDF document text
    • http://reduslimitalia.website/losanudijevawev4zuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/building_by_laws_in_zimbabwe.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/hard_multiplication_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/55230193999.pdfIn PDF document text
    • http://wowarawepikoxa.rf.gd/40594092174.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/transformers_antagonist_crossword_puzzle_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/75656300328.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/surodog.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/parallel_perpendicular_intersecting_worksheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 5328 bytes
SHA-256: c4776436d54340f570d88cdf6c32b1b6cf577b718fa81126b6c1ec4cd3cd2ae9
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 11724 bytes
SHA-256: ea4ddac007b048c16b60f1f3ab30fd340e2521f2111b993aaa0c8d9d5efe1fa8
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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