Malicious PDF — malware analysis report

Static analysis result for SHA-256 88adc3560bc9ff97…

MALICIOUS

PDF

90.5 KB Created: 2021-03-23 14:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 037ad00129d9568024a21b04699a3e62 SHA-1: 2745c6970e5a2f535ffefcb188f4d280a5d51e38 SHA-256: 88adc3560bc9ff971945a40c19b362980fca4f1e704e28e3c6dfc400fde0decf
126 Risk Score

Malware Insights

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

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute various lures. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://leonvi.ru/wix?keyword=tepezcohuite+cream+walgreens PDF link annotation
    • http://belplitka.ru/dvdfab_free_download_full_version_crackrsetf.pdfIn PDF document text
    • http://paktum.pro/ana_safe_staffingwrfi3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_604491a38f80d.pdfIn PDF document text
    • http://gapojigewe.22web.org/fulton_county_il_sheriff_reports.pdfIn PDF document text
    • http://kersita.space/dragon_rampant_freeca018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_6025978d8bae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5ffda7736928a.pdfIn PDF document text
    • http://trysoda.pro/caballo_de_troya_librofvx2k.pdfIn PDF document text
    • http://awpmode.com/86882946899ik82d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_0a0ba82209214914b0cf7f1191dcce3e.pdf?index=trueIn PDF document text
    • http://jirizaxewusi.epizy.com/colt_ar15_magazine_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bda992-041b-4069-bb55-46944d0d9194/how_to_check_serial_number_in_linux_by_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c5fd24-f09b-4d65-8281-15017d60a4e7/god_in_the_dock_cs_lewis.pdfIn PDF document text
    • http://fatofejeripise.rf.gd/93622380133.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_472f253b773440f9943990362d2ef559.pdf?index=trueIn PDF document text
    • http://wupofopevina.epizy.com/bataniwanakozedisinubatat.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_f52a0e06367e43a7af138d05a078394c.pdf?index=trueIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_6974ffd1ea67405cbeb61964a3010d57.pdf?index=trueIn PDF document text
    • http://bamasagure.epizy.com/desk_calendar_photoshop_template.pdfIn PDF document text
    • http://xelemuxegerupob.rf.gd/630871160.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 5436 bytes
SHA-256: 8ebf9611113a8a1fbe9a3314c9da3842b62621f38f700827736f46735ea7db43
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 4148 bytes
SHA-256: bb6e18e1dfacad393c2f44d38c1ebf6a7ff51483237a136c040568f70fd0d1ab
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 10856 bytes
SHA-256: 87fb6aa04710471df9d8537b1977d1f3ac225e9a407fd488d56ed29125e59d08
font_03_sfnt_off0001467b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467B 16344 bytes
SHA-256: 3745d395dffe053ce12bb6e6d543a89fda750690c61e1e786fb35984b58e44e5