Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d8753351fac968…

MALICIOUS

PDF

78.6 KB Created: 2021-02-28 20:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 920329fa070a1e7d928c8a410bb3e2b3 SHA-1: c475e6bd3044efda7705bc099fae90837cc99fe8 SHA-256: 09d8753351fac96848dbc9ee57e23fcaa2dee9c395f2c21e6e11d3556e43d3b7
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 the document body is heavily obfuscated, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

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://dugedepap.ru/wix?keyword=case+1840+service+manual PDF link annotation
    • http://soldatskaya6.ru/309388624702l5rd.pdfIn PDF document text
    • http://senukekufop.iblogger.org/company_profile_format_powerpoint.pdfIn PDF document text
    • http://lazezubeb.22web.org/focusrite_scarlett_2i2_setup_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_600d27a638034.pdfIn PDF document text
    • http://dakijexok.22web.org/49151053002.pdfIn PDF document text
    • http://bomufofo.iblogger.org/can_you_reset_a_whirlpool_refrigerator.pdfIn PDF document text
    • http://znohist.site/puzegoblprye.pdfIn PDF document text
    • http://medgaj.com/i_cant_make_this_up_kevin_hart_amazon7ddtm.pdfIn PDF document text
    • http://gavazugemopemoj.22web.org/potizopavawilozukus.pdfIn PDF document text
    • http://fabermanufacture.ru/horror_dark_death_blood-_apus_launcher_themes_2018mln3a.pdfIn PDF document text
    • http://wigisosidika.22web.org/development_across_the_lifespan_7th_edition_feldman_download.pdfIn PDF document text
    • http://bijipejip.iblogger.org/kellenberg_style_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_603b7ea2bd6d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugunimekuxaf.epizy.com/powuxexilitovino.pdfIn PDF document text
    • http://bevunogigofijag.rf.gd/whats_a_good_name_for_a_jewelry_business.pdfIn PDF document text
    • http://warepeg.rf.gd/visual_studio_2012_platform_toolset.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 6416 bytes
SHA-256: 15f1f49b80f446e7933a40d6c5645ba9b1ad3ddb6c90b7ed74ec66770e7def8a
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 5388 bytes
SHA-256: 3c25b7dcdf6b4e9ea5159b2f86c14ec18f6a6c33b48b86e5a8aa2a9e1c802aaa
font_02_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10504 bytes
SHA-256: a3f415172a7245cf89a7983dff1be126c3037b845449d91fc002bc5b38bca83e

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