Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc891cbbb6ffd76…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 11:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3e289542ca62200ab2b05a93436ec9 SHA-1: 39b6c16dcc5e9f50c18873ac8e8f184a7986397b SHA-256: 5cc891cbbb6ffd76b29376f5ba1fec582af8b835dd2432d1a00c1a88802aaef4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The primary malicious URLs identified are https://kuzutuzo.ru/wix?keyword=if+you+should+lose+me+lyrics and http://nozatisesufi.scienceontheweb.net/watogurekiniravuludimine.pdf, which are likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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/wix?keyword=if+you+should+lose+me+lyrics
    • http://nozatisesufi.scienceontheweb.net/watogurekiniravuludimine.pdf
    • https://cdn-cms.f-static.net/uploads/4475196/normal_600fb14fc2ead.pdf
    • http://lajodibibodi.getenjoyment.net/how_do_i_access_facebook_marketplace_on_desktop.pdf
    • http://zugasanuko.getenjoyment.net/vomomasegujuz.pdf
    • https://cdn-cms.f-static.net/uploads/4415962/normal_6044a6b76e3db.pdf
    • http://fodekofuxuvum.sportsontheweb.net/korg_electribe_2_sampler_manuale_italiano.pdf
    • http://vowujebotoza.mywebcommunity.org/jefiguri.pdf
    • http://fawikenaxalu.scienceontheweb.net/46017796347.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fcf07ebbdde3.pdf
    • http://xojuxelase.medianewsonline.com/how_much_does_a_sony_bravia_55_inch_weight.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e7ed54d8-e890-4c3e-a98e-f5ab1dbcde22/what_was_the_purpose_of_the_franco_russian_alliance.pdf
    • https://uploads.strikinglycdn.com/files/9dc20685-803e-40f2-8c85-29af4f613b92/senuv.pdf
    • https://s3.amazonaws.com/megodipewukitoj/kejemozuzirinozowozoruni.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_a9eef4adb631493798bba333f8d13067.pdf?index=true
    • https://s3.amazonaws.com/dakebesuvum/33153577952.pdf
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_ae18eccc0ba9400eac03f387a72a3534.pdf?index=true
    • https://s3.amazonaws.com/lefemijip/caillou_theme_song_piano_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/c834dcf6-1e07-4e81-8b76-51e7f65796d5/74576646813.pdf
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_9db1fbd892274ac99a390d9f8108248c.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/aparichitudu_telugu_video_songs_hd.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_3f216095721441bf993f2b7edaad2c2a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a11eb181-c95f-4335-8419-4c1da43062d3/78008546866.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/mathematics_for_economists.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dd.bin
31751ecf3443889d5c2a5f1c328a8096a5ca1f9f0e5090ce6874b0ce18979c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 4788 bytes
font_01_sfnt_off0000f619.bin
98fa44e524142b62bdba872a71d28d57edfc5e323d4dd352e23468f4846aefc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10824 bytes
font_02_sfnt_off00011b1f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 4324 bytes

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