Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc94b71026a04618…

MALICIOUS

PDF

75.1 KB Created: 2021-05-10 16:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 98f31f9a3dcb3f730b52e72fde32aecc SHA-1: 2e034d67b0bf97737ab32d7f2eb905d92ac8c646 SHA-256: fc94b71026a046182de98aebf450422bfb9be5a97b72efd046ae762b1f0c1249
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm on disposable hosting, with a high ML classifier score and ClamAV detection indicating malicious intent. The document body, though heavily obfuscated, contains references to technical topics and potentially misleading keywords, suggesting a lure. The presence of numerous external links, including those on domains like lozipotod.ru and inmyshtangen.xyz, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=dell+t3500+memory+slot+configuration PDF link annotation
    • http://inmyshtangen.xyz/how_to_clean_a_toro_snowblower_carburetor_without_removing_itzfkby.pdfIn PDF document text
    • http://zanartcc.net/nursing_2020_drug_handbookjhuvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5fdfde0f3f556.pdfIn PDF document text
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/5657122.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://fixmarker.fun/integrated_chinese_level_1_part_2_workbooke13iw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_606bc68281538.pdfIn PDF document text
    • http://cashbackk.site/aprender_ingles_facil_para_niosmx34v.pdfIn PDF document text
    • http://thesimplycompleteseries.com/nts_answer_key_2019_lumhsylbda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_605ef7a632957.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/cab4473.pdfIn PDF document text
    • http://ketousa.site/64850179836aoeab.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/6c45e6fc505d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_13faa7ee829b41348bfb94e3aaf4301a.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_360b5be23401495ca9e2ae5e3cb9fbd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4918c545-46d6-4ee3-93c4-12a313d1651d/lagulezafavevulumutasiluw.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e90a252ffa7e4540bc16f5b6f2fcecae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e27723-2a93-43df-a2c7-cf6770be10c1/lajabidutazube.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_6b1e323f1e5b4056ac004d1497fd98d5.pdf?index=trueIn 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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 5732 bytes
SHA-256: be9ceeb40be56079688f76024543b4fb922741067616e3d1f131e33afee861a1
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 11296 bytes
SHA-256: 57dd34ca459867ec60e49ed9d89cef6046f5a625e6f9f9feefad9fbb0bc764af