Malicious PDF — malware analysis report

Static analysis result for SHA-256 74587d680cb18d55…

MALICIOUS

PDF

80.8 KB Created: 2021-05-16 12:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fe76a702fc3949d8dba8c0c24b7fa3dd SHA-1: 6085e8dfb894fd4ae3e66991de902334c5295206 SHA-256: 74587d680cb18d552cad6d370a8765c199269ba9d150200c64b983b7e710b039
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URIs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=can+rice+have+calories PDF link annotation
    • https://cdn.sqhk.co/xonipavu/jdjbjc1/recharge_mobicarte_sosh.pdfIn PDF document text
    • http://tugrull.com/what_is_special_customary_international_lawjzfpz.pdfIn PDF document text
    • http://mstmail.space/245540257445qzb9.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/ids3mjd/pugixipu.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/91569205236.pdfIn PDF document text
    • http://umkatrade.ru/marketing_management_conceptsgo9wy.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/giLtL1n/google_play_games_apk_for_android_7._0.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/haVigjh/americinn_easy_rewards_login.pdfIn PDF document text
    • http://mopomelodow.iblogger.org/computer_networking_basics_tutorial.pdfIn PDF document text
    • http://itasda.online/exercicis_dels_complements_verbalswnxuj.pdfIn PDF document text
    • http://carinsusa.com/are_they_making_a_wings_of_fire_movieorsdg.pdfIn PDF document text
    • http://robertferrell.net/29727682584wugsi.pdfIn PDF document text
    • http://petersikdar.com/zepovolzze9r.pdfIn PDF document text
    • http://glawerry.online/canon_in_d_easy_piano_free0wknh.pdfIn PDF document text
    • http://patagoxipu.iblogger.org/60192232735.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://vertigoa.online/nine_stars_trash_can_21_gallon_bags3es49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimavaju.epizy.com/hampton_bay_e75795_yl.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/ms_250_carb_settings.pdfIn PDF document text
    • http://jusolasoxo.epizy.com/is_firehouse_subs_expensive.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/dowinuxijazusunubejiveb.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/xawalokafopozifevin.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_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 4852 bytes
SHA-256: 5bed8ad1ce754f71e76c73ef83ba1c615f0254a6ed936a75145a7578323a238b
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 10544 bytes
SHA-256: 2acc24e71daddb6b89bccd104052548f1591cccc685d791ff536f19b3759233d

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