Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a1500ef4eb9291…

MALICIOUS

PDF

81.7 KB Created: 2021-05-06 19:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cfc652176230bf6d8e594db49b35766b SHA-1: 27211f33a47c386e7ed52cb63ef31adc8f6b4e05 SHA-256: a4a1500ef4eb929138ced71c93d98a126ef3239571749774f4fdc22f245a29de
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing attempt. The document contains numerous embedded URLs, with a primary malicious URL being https://jumiwimov.ru/strik?utm_term=night+owl+dvr+ddns+setup, likely intended to redirect the user to a compromised site. The presence of multiple links and disposable hosting suggests a link farm used for obfuscation and evasion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=night+owl+dvr+ddns+setup PDF link annotation
    • https://cdn.sqhk.co/sogunixe/PJoghgi/golumilixekukomifixeridaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5fdffe0c2cc6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_6068f4cfdce25.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/jhujcja/zombie_chasers_book_synopsis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_5ffde19151ef9.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/Oge0ijm/duvatufopibitusanexobalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500669/normal_5fe052f103ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_600c81ce89d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_606c88e15a3cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/gehf9hj/gun_shoot_war_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/4QrSOgi/temple_run_2_lost_jungle_lantern_festival_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601b004fb59fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_6d839d2efa294e9495c5a537976977a0.pdf?index=trueIn PDF document text
    • http://sewemira.atwebpages.com/pusej.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_48c7898a9ed94f22aac7632c2a858b3a.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_41da9516e37d4961981ced2441035f55.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_e983207a73b146b19dd25c34cbb55f4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51d07c5-2b63-4641-9d4d-7463e32d56ac/fl_studio_tutorial_for_beginners_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418fe72e-71c7-4895-b441-242f923bf97c/food_matters_holly_bauer_free.pdfIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_36ec1a03a5414264a1cddf4e73dd8362.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91b645a-23a5-4433-9862-e946d5148abd/vupitiwugebamepadonix.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/university_games_brown_bear-panda_bear_what_do_you_see_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48998dbe-a776-482a-9248-f7d352c2b971/metamorfosis_de_la_mariposa_para_nios_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7305bd-d19e-4834-8b2d-1a3d5292fe4f/pillars_of_the_earth_book_2_achievement_guide.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_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 5132 bytes
SHA-256: 433f1d67be367a3c52f67a42801ed7891dfc9bb5d60f5204f25770ba8cf135e9
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10816 bytes
SHA-256: d36db8bc8d98d571a14e52ac157107def54a203c6dd6332b101b4e9fb21ecc1b