Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f4dca23785f3fb…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 21:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 97f9bfc09597a96f371f116052fe49b0 SHA-1: a42a5194a6c616359bf6c574985da4b72ec88839 SHA-256: 47f4dca23785f3fb8938ff49c99968708e25bab88ec99b1b3b2bc2a14cee913a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, identified by heuristics as a link farm on disposable hosting and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to research variables. The presence of external URIs and the overall detection by multiple engines strongly indicate a phishing or malware distribution attempt.

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://bologen.ru/award?keyword=variables+in+research+pdf PDF link annotation
    • https://cdn.sqhk.co/gogojelawov/iHIaAhh/digix.pdfIn PDF document text
    • http://taptopbot.com/32392385783uw9k5.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/ijgU5q5/how_to_potty_train_a_child_with_autism.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/fpvifgh/wuwugalezukevaneramabaju.pdfIn PDF document text
    • http://secret-empire.ru/video_editing_software_free_full_versionktzxm.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/ibig5jg/xelago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_604721707f011.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hbid6Ly/battle_royale_3d_warrior63_apk_home.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5fc953ffeb990.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gcqQYhj/animation_movie_wallpapers_for_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604d027629246.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/ajagjhg/difference_between_gravity_blanket_and_weighted_blanket.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/3hgrjfo/46974551083.pdfIn PDF document text
    • http://my-credit.info/depaxamizalixawtd2f6.pdfIn PDF document text
    • http://salonlabs.xyz/como_fazer_um_molho_ros_para_macarrovosd7.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/muxegeza/asus_rt-ac87u_router_review.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/64384683901.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/atv_dump_trailer_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/john_paul_jackson_books.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/diccionario_etimologico_griego_latin_del_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/1991_polaris_trail_boss_250_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/46755435910.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 5348 bytes
SHA-256: 8c274ee4a184322cb413702e4780417ce68790cd1b9926361f4ca0682e5294a2
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10788 bytes
SHA-256: 6187e838655dc837ca60ff1859cf0e36d530c6df460c4794e59439eb3b81b55c

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