Malicious PDF — malware analysis report

Static analysis result for SHA-256 4042cb0ad8cd273f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 05:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 44b86bd88f60680b4bb6c56172a4ab4f SHA-1: 042886191fa76da2e5785fc9fd7063564af65def SHA-256: 4042cb0ad8cd273fc6d8127ba22a7d91716f534b16d970968f2bf5347a334620
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=attention+deficit+hyperactivity+disorder+adhd+pdf PDF link annotation
    • http://mapenibo.scienceontheweb.net/biodata_tun_dr_mahathir.pdfIn PDF document text
    • http://faceit.su/que_significa_cuando_sueas_embarazoaf17l.pdfIn PDF document text
    • http://konsalting.info/vivitos31na.pdfIn PDF document text
    • http://mobile-media.moscow/193861181504vikc.pdfIn PDF document text
    • http://ersoil.fun/56704025729x2lfe.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/karma_short_story_download.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/65669901132.pdfIn PDF document text
    • http://circulshtangcalip.website/hunter_x_core_test_programsmuh2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add04430-dafb-41c6-b203-1ac03d25e41c/washington_football_team_jerseys_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cf72cd-d1fc-416a-84ac-8a61c0156687/73532883113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a1d3d0-82e4-4820-9374-1b4d49eebe00/easy_way_to_quit_drinking_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c292173-125b-4dcc-b066-b6507c5788ff/29101772192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24eb3d5-ce98-40a5-b34b-40764ee5ec0d/xewemizuxowusaxigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206198f9-618a-4d4f-893c-2053eddf8eea/61540607915.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/does_snow_white_die_in_the_original_story.pdfIn PDF document text
    • http://samajusinifako.atwebpages.com/50707881789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c24e89-2199-467b-acaf-a206483ef4f8/nabanu.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_e77d9b352cd749baadc033534b0fea1b.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_63d34886add4454ea2b84cd8f5167503.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_c6f6e489228b4fefb1fa6658ee467ab6.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/kuwugafovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11eb7dec-acc4-44b8-b995-90cba22c8884/are_romeo_y_julieta_cigars_good.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/wosudiligosigiguzabi.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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 5364 bytes
SHA-256: 07fbd3963f51b3556d68e79fea66d5f697739f4a3cb3961dc943d377268832fc
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10608 bytes
SHA-256: 4f4559f6ec0273d900d9c1ec842e66341b4ee35e736565780fbe8bef68dbba8b