Malicious PDF — malware analysis report

Static analysis result for SHA-256 c360208c334de36f…

MALICIOUS

PDF

108.6 KB Created: 2021-02-26 16:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c52332620da1cf0daac319b6098453d2 SHA-1: 6feceefa7edbac3fbf15585ecf7275facc8e949c SHA-256: c360208c334de36f4711da640e69cd7406a6c4d617c31424c9656bac1d140501
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 domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kuzutuzo.ru/123?utm_term=physics+solution+class+12+rbse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483388/normal_601911208a824.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/business_communication_today_13th_edition_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ffc17c6ad579.pdfIn PDF document text
    • http://delinapod.mypressonline.com/intex_sand_filter_and_saltwater_system_combo.pdfIn PDF document text
    • http://itsnat.space/nusiwodanesatufusebafaxim2s2w6.pdfIn PDF document text
    • http://zootime.store/lavyrle_spencer_booksj171u.pdfIn PDF document text
    • http://myirn.icu/13567909390k07pw.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/iohfibs/free_cubes_math_strategy_printable.pdfIn PDF document text
    • http://luminar4-download.xyz/easy_way_to_record_screen_windows_7_free75sr1.pdfIn PDF document text
    • http://idealica-italiaofficial.site/showbox_apk_mirror_latest_versionwi12k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_600c6542c9d20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5fc97b79e76d4.pdfIn PDF document text
    • http://marketitaly.pro/twilight_render_for_sketchup_8_free_download_full_versionzb7tm.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/java_programming_tutorial_video.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/gh7Vtjh/dancing_ballerina_brain.pdfIn PDF document text
    • http://chambrely.xyz/guvuxitudevolurgx3h7.pdfIn PDF document text
    • http://return-0.com/wisosotaxgcics.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gcVieig/14976341804.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/57152492427.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/gdgd7gO/dunk_n_beat_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubune.myartsonline.com/15_hp_gamefisher_outboard_weight.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/craftsman_torque_wrench_owners_manual.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/bezamebufojolesabira.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/vonshef_manual_pasta_maker_instructions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 3080 bytes
SHA-256: 3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c
font_01_sfnt_off00014f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F14 5316 bytes
SHA-256: 6415135764cfce7ec34c1a3446e040b1735ed4298bfae6da399fd7782994999b
font_02_sfnt_off00016130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16130 13032 bytes
SHA-256: 54eb14b8d8c5087ce5cdae8a33529d1163f61f0db09348991be4945f72bcbabc
font_03_sfnt_off00018d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8A 16372 bytes
SHA-256: dafd2cf5953effbec1510656c6c97337dfc2a9dda157b173544d48bc67913a0f