Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68cc9f0b3d1fbc6…

MALICIOUS

PDF

75.4 KB Created: 2021-04-16 20:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1c863fafb55989f1e53403df9edf13 SHA-1: 995d05734c6be8c224ef18a957d000c7110e1576 SHA-256: e68cc9f0b3d1fbc69dfbcb9775fd85e2886123c433f3e78d1f1ef023c2efbcfd
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 a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites for phishing or malware downloads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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://druttle.ru/strik?utm_term=measure+interior+angle+regular+pentagon
    • http://zivemigidefis.mypressonline.com/are_simple_molecules_soluble_in_water.pdf
    • http://xorabawik.medianewsonline.com/carry_on_luggage_sale_macys.pdf
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fda4b850bc7d.pdf
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6054b9d60e5d3.pdf
    • https://cdn.sqhk.co/pefisemise/jg7BLge/lost_in_harmony_mod_apk_2._2._20.pdf
    • http://kafofal.mygamesonline.org/rivatezuvekobufo.pdf
    • http://raxejudesezix.scienceontheweb.net/fulewujudozo.pdf
    • https://cdn-cms.f-static.net/uploads/4483608/normal_5fd87b976d7b9.pdf
    • http://nepatokada.mypressonline.com/human_axial_skeleton.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fda1e1a16005.pdf
    • https://cdn.sqhk.co/degawatoze/Bck1gds/space_shooter_gift_code_september_2020.pdf
    • https://cdn.sqhk.co/maxevurux/THggDic/snow_mountain_ranch_in_colorado.pdf
    • https://cdn-cms.f-static.net/uploads/4488592/normal_5fd8e1184f095.pdf
    • https://cdn-cms.f-static.net/uploads/4480387/normal_602eb8246de40.pdf
    • https://cdn.sqhk.co/defegitip/lcSQn3h/23144830791.pdf
    • https://cdn.sqhk.co/soziwariru/hjgejbH/13434040137.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f582772a-857a-414f-a9ed-37905b766b11/57951434272.pdf
    • https://uploads.strikinglycdn.com/files/559e7e30-bec8-4559-8b77-6b3e257081f8/zivem.pdf
    • https://uploads.strikinglycdn.com/files/158514a8-8992-4237-b068-30838d73b4ff/adobe_premiere_cc_2017_tutorial.pdf
    • http://kozogasivufi.myartsonline.com/bony_to_beastly_program_download.pdf
    • http://wonanikapudidak.atwebpages.com/saxugirarupukitemukejom.pdf
    • https://uploads.strikinglycdn.com/files/b87920f8-bdb9-467c-a8d3-1874eb91552d/lenovo_g50-45_wifi_driver_windows_10.pdf
    • http://zeroxezubanalil.onlinewebshop.net/etymology_bible.pdf
    • http://somifisuvukibuk.onlinewebshop.net/burial_rites_full_book.pdf
    • http://bodegifu.atwebpages.com/remington_pole_saw_repair_parts.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ed.bin
3df06f69cefa3a2f263583a0d84adbe878a677cee4c93244c2fd627bf0683a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 4992 bytes
font_01_sfnt_off0000fa04.bin
9ac350b3614b25134784d636e862bb98ad9b764c86d39a5cff1dc675565647d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 11188 bytes

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