Malicious PDF — malware analysis report

Static analysis result for SHA-256 879ccb43ff8598e8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 02:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9776d28c53ee5f3f27a6d584023bdaf SHA-1: ee8468e18c6ea9f5463e122edf5fd01a05390943 SHA-256: 879ccb43ff8598e8a7fd5158ea18667e8c543b941d77c61e35f7f51511736e98
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents hosted on disposable or suspicious domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly suggest an intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://dugedepap.ru/award?keyword=multivariate+regression+models+for+panel+data+pdf PDF link annotation
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/ruboxojebeja-bemumevop.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/7jhifww/cannon_breech_shotgun_worth.pdfIn PDF document text
    • https://xavaruren.weebly.com/uploads/1/3/1/3/131383751/098a603.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/jcZZMgi/teripedowesitexijowopibo.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/jegfiag/at_t_u_verse_tv_channel_packages.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/sujuvobu-gunixazufe-vanonononilun.pdfIn PDF document text
    • http://megatorg.ru/90124419647s5lzi.pdfIn PDF document text
    • https://dexulana.weebly.com/uploads/1/3/4/2/134234773/3cd57841c51e73e.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/4ibK4dq/kowifosajuraz.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/eyrjj1k/chicken_run_locust_grove_luella.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/what_good_business_to_start_in_philippinesv578v.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/EbhgicX/self_appraisal_answers_examples.pdfIn PDF document text
    • http://werewov.22web.org/gokanof.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ap2cqic/wesapowilixinugepezugux.pdfIn PDF document text
    • http://akb54.ru/34777095495cqt7n.pdfIn PDF document text
    • http://lovelid.xyz/powerdirector_android_app_tutorial2phke.pdfIn PDF document text
    • http://vumilopevakidom.iblogger.org/beiimaan_love_film_all_song.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/fonanuv_nikored_pujekevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vijanemafe.rf.gd/calendrio_2019_excel_para_anotaes.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/google_sheets_manychat.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/american_university_in_cairo_contact_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/spacex_ocean_landing_platform.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/cancellaresca_script_std_free.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5428 bytes
SHA-256: 5b19bfe73b11dd2a5773fd8d29be1740063621776c682021584c35ce54a69b37
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 12004 bytes
SHA-256: e23b7a840962a101d737f7bc3293095b42b6da0ec3d3c42fa495e565ff0577dd