Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ed91c02514696c…

MALICIOUS

PDF

104.5 KB Created: 2021-02-13 14:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0d5cba210bed5e56e8293f1499af65ec SHA-1: eec816c1c6aea3e5fac465236e2f3da3329d0e10 SHA-256: 75ed91c02514696c3607e5e9f29b3f72767c22fd4da2ea057fd43fa34efc7a99
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'batter boards for deck' and appears to be part of a link farm designed to direct users to potentially harmful websites. The presence of numerous embedded URLs supports the conclusion that this document is a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/wix?keyword=batter+boards+for+deck In PDF document text
    • http://eurofamily.pro/birthday_collage_maker_for_pchu3e4.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/srhdjcK/vojove.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/faKihHO/51195959207.pdfIn PDF document text
    • http://ifeelgood.club/76245612037jbvwg.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/mimuzalupi1trhe.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/gf4RmSz/48882357189.pdfIn PDF document text
    • http://jujiwaneko.iblogger.org/a._n._m_full_form_in_english.pdfIn PDF document text
    • http://classicalnaturally.com/gegatimegudokigp5dxd.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/KijDPjd/cho_sun_ok_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/vkjieF8/95042157612.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/heKkbid/evil_nurse_scary_horror_game_adventure_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/jjjdjgQ/78042011249.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/kphfhei/superhero_costume_creator.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/jebokizez/lupokiwilukaluwu.pdfIn PDF document text
    • http://kanulojijuk.rf.gd/23911903871.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/bestanden_versturen_via_bluetooth_android.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/6019137158.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/69046268764.pdfIn PDF document text
    • http://gipumupanaw.rf.gd/67021769008.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/flubber_imdb_parents_guide.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_off00015f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F96 5236 bytes
SHA-256: f27234aa12ac5e1e2d0f29187b13071a3c139e967666377513374ab458fa61b9
font_01_sfnt_off00017176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17176 10196 bytes
SHA-256: 9d1ee81478575123784c13da8a2ec4569a10bb680bcc38010ccb14ef0c90a50a

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