Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9cd1738dc0d957…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 17:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 88855d467bd6a6383d781b2a4a1c6f54 SHA-1: 100032e642303f55c7c9cd57c24607841edbefc5 SHA-256: ad9cd1738dc0d95717ea0c9fddc9177e968f926ce3dd2f6670d93855b925f94d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=power+of+positive+thinking+reviews PDF link annotation
    • http://azorocheat1.xyz/where_is_wps_button_on_netgear_n600_routermin8m.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/tbUjgFw/xewawer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_605c5832c80a8.pdfIn PDF document text
    • http://fexerekuvise.iblogger.org/72533286248.pdfIn PDF document text
    • http://varuvoruva.iblogger.org/keto_diet_list_of_foods.pdfIn PDF document text
    • http://profyhouse.ru/407138386839netj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6067f97199ced.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/dsbgigc/easy_loader_trailer_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_60098f91e4e22.pdfIn PDF document text
    • http://neyroskakalka.site/312832967148qwnw.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/Tyq5nhj/wikawawigudikokupo.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/eEetjbM/87172989115.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/c038065a-9583-408d-af9b-565fd159aa5f/97244967853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581d3303-f281-4e23-aba6-afdfcc79a182/lokotokimugolenawezel.pdfIn PDF document text
    • http://vanepozimor.rf.gd/71338149180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa98df23-3ae5-46e4-a82c-2eee8006c0fc/daniel_plan_apple_crisp.pdfIn PDF document text
    • http://gokegufokefewev.rf.gd/bodied_movie_soundtrack.pdfIn PDF document text
    • http://luwosidomenab.rf.gd/define_utility_in_economics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b87eee-b86b-4832-92ef-7771f5f8e9d8/medieval_2_total_war_stainless_steel_6.4_download.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5136 bytes
SHA-256: 31b77aacaad691791ae73fac2eb5a3e17830c2f4fe028e055c7243bdd1ef6395
font_01_sfnt_off0000fa53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA53 10484 bytes
SHA-256: 76369cb87433be2ae3770aee7c5594658858f4906635f2d41f8655e309173b3b