Malicious PDF — malware analysis report

Static analysis result for SHA-256 19935da8c60a9f05…

MALICIOUS

PDF

84.6 KB Created: 2021-02-24 17:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f34d2539ab6f426f23c287825eb85ad SHA-1: 15fabce7f3528e14beef87f1a6ae1e3f9e9086e8 SHA-256: 19935da8c60a9f053773a57ca561812402dd8f79f155eb1eff893f9248003353
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including critical alerts for linking to known malicious redirectors and being part of a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to downloading an APK, suggesting a lure for users to download potentially unwanted or malicious applications. The embedded URLs point to various domains, many of which are associated with link farms and redirectors, indicating a phishing or malware distribution attempt.

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
  • 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=lg+g3+music+player+apk+download In PDF document text
    • http://klossheff.xyz/87967620896e739h.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/62644825291.pdfIn PDF document text
    • http://onlajn-kassa.ru/muvokafitadj1.pdfIn PDF document text
    • http://betmoy56.com/backtracking_in_data_structurexx8v9.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/aM6wxrK/eggplant_boats_chickpeas.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/gcnnhbQ/lemonade_pie_recipe_easy.pdfIn PDF document text
    • http://wwbook.org/54269665206i4phy.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/57985916940.pdfIn PDF document text
    • http://paselon.getenjoyment.net/a_little_history_of_the_world_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/2if7Vig/x_plane_10_flight_simulator_apk_free_download.pdfIn PDF document text
    • http://geosen.net/97913630601w82ru.pdfIn PDF document text
    • http://reassurez-moi-fr.info/gcse_physics_resultant_forces_worksheetr3g5w.pdfIn PDF document text
    • http://freud.icu/mens_health_training_programs5txg9.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/conair_portable_steamer_not_working.pdfIn PDF document text
    • http://dajexori.mypressonline.com/vitamix_e310_explorian_series_blender_review.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/lurutopobi/91376969091.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/53968489466.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/fogazerewolebitiluginexi.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/kodopoluv.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_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 5756 bytes
SHA-256: 9cf7d14d31688cb9fd19894109c2db5684adb2d9fc861ed1e64268d215651cc8
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 10412 bytes
SHA-256: 18e46dce828f1e9267254762fa548ae2de4f3ce793b836033908a56d66cdbf36

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