Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a27ca75ca12fb…

MALICIOUS

PDF

128.1 KB Created: 2021-02-14 08:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 427923fdd40f8a7d9346e79c5d579840 SHA-1: 0bfa463d0b38b0e526a9d77725e842548890e837 SHA-256: 756a27ca75ca12fbb3f5c3dcf38ab0743c03c1e7d8409fec628ce1136ac8a595
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, one of which is associated with a sound app for Android. The presence of urgency language in the document body further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/aws?utm_term=sound+app+for+android+free PDF link annotation
    • https://cdn.sqhk.co/bapuwanuvadi/WIAZgiS/baby_stock_cubes_tesco.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/cjfTGUO/62143997789.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/LjjhUI8/ffxv_guide_gamefaqs.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/iIhjha3/space_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/dFheAja/gedifusujo.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/licNhaE/dragonvale_world_dragons.pdfIn PDF document text
    • http://egosikenclub.com/54812306355m0qlz.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/g69Ujb0/84164574189.pdfIn PDF document text
    • http://redtea.space/korarezekakogobutifewug9x64o.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/jvUjavV/98867244857.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/AYjiiPL/tank_1990_battle_city_pc_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/gihbhfP/cronosurf_wave_watch_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bebetirifam/hgO0lhg/verikatujorivij.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jhjhhb5/64696057976.pdfIn PDF document text
    • http://sellamorem.com/jemajonufezumerabutingwz.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/zhbKrSY/download_game_mopar_drag_n_brag_mod_apk.pdfIn PDF document text
    • http://hh666o.site/144803159875pbna.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/CAQ2gha/zarite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukuzuwikisos.epizy.com/3124545371.pdfIn PDF document text
    • http://dudotofuzariw.rf.gd/37635460591.pdfIn PDF document text
    • http://siparedobapu.rf.gd/free_html5_templates_dashboard.pdfIn PDF document text
    • http://nijorirofebonin.epizy.com/16106808073.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_off0001bb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB2D 4928 bytes
SHA-256: eecc5525ee29aa16a93246dbe7bd8ddf7e887cfd08b89f4f90726633cd8cb200
font_01_sfnt_off0001cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC02 11504 bytes
SHA-256: 8a66907785979cbbe846369b6397ac32201c8bd1b07d21c4118b78ace301891e

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