Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcb6c096abdf04a…

MALICIOUS

PDF

101.8 KB Created: 2021-04-11 17:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e5c0775b2f686a3a5ccb466a00f65fa SHA-1: 71c664f93a41f916664cf9d983198f30f120c41d SHA-256: 4dcb6c096abdf04a65746025243c83572cd92f7072c468480660dee76173fc81
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable one pointing to 'jottigo.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://jottigo.ru/strik?utm_term=vishnu+sahasranamam+hindi+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445541/normal_605fa39d5cf3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_601ef64b018ea.pdfIn PDF document text
    • http://kuzaduxojotijid.22web.org/awaken_the_giant_within_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/jgjhjhd/97972107153.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/jovawemuxubexokatale.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/hejcTgi/roller_skate_3d_print.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/86edbe9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fd632c5bc69e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_606acb3028966.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/2ca208a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/FwNihKF/learn_to_draw_monster_high_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/cgdyjcX/devexawowunelosumede.pdfIn PDF document text
    • http://jetavimazi.22web.org/jukuvulabujad.pdfIn PDF document text
    • https://mubuwevuli.weebly.com/uploads/1/3/4/5/134528176/jitofu.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/dhnShbr/52443530310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_1941f3101e2d44d6af08b3f6a19c2fba.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_4f542d5d7dd8436486bc3f736747cfa8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kimone/apartment_lease_form_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/bhai_ji_full_movie.pdfIn PDF document text
    • http://tereralubo.epizy.com/analog_clock_worksheets_free.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_9eb8a4bbea424ef7a51bba2e362c6910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipinib/browser_benchmark_2018_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/template_aturcara_program.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/power_of_the_cross_piano_chords.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 5172 bytes
SHA-256: e82b17b973244c0a3699694c8987eafd16f492f5f90f6c517ba804577219308b
font_01_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 7828 bytes
SHA-256: 895dc77554d807ede0aafe19e0f4cecbe1ca54edb1ddca1490607e3277e9740a
font_02_sfnt_off00013efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFA 10928 bytes
SHA-256: 1912b38250adc1c7c01d550c6dd36a9d433aa0cc5517df9d973b471826175eef
font_03_sfnt_off000164a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A1 16336 bytes
SHA-256: 2c8dd6c7a28a84918c13eff9c382bc01327f684d9001f6dca27e14c0f656ec2d
font_04_sfnt_off00017aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAC 3024 bytes
SHA-256: c4ebf34f2d4261ae26c4fc5cb7bffbcccb59c5d4e9a30069f5634a7fa625a69f

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