Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e450f53d7f35b38…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 16:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40fc41bc7b70911b647e93bf0ba24fb7 SHA-1: 3ebbbeaf5cb0b89b41be62c4e620b2f6887ab52a SHA-256: 2e450f53d7f35b38fdc7ce3db013d728bb1d607e7334e7e1d25505fb04cde2e3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain metadata related to job descriptions and the wkhtmltopdf tool, potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=chief+information+governance+officer+job+description PDF link annotation
    • http://jakufodunod.getenjoyment.net/26308693634.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/gghchic/kegusujutevimere.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/19725216175.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/iJhiHif/53616020192.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/idGgeSx/mini_golf_100_level_98.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/g2av2he/narememupe.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/idibrgg/podem.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/hbgghhc/disney_archer_princess.pdfIn PDF document text
    • https://cdn.sqhk.co/ninevowa/ifzHSgd/cambridge_oxford_dictionary_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hdFgjjf/mumusapupan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guseboses.atwebpages.com/31957503394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae14767-8d7d-4993-9e7d-a0ba7ffda4b3/niravo.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/wowuzemewe.pdfIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_7b1d7ddbb061496298b71ea0c5e1c8f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda4acdb-6546-4285-9aee-c461c8ebff97/6321861334.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/minecraft_windows_10_maps_free.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/winotirebuwadeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dc2f15-c8ba-492a-a7a9-a45b0a596ffe/ronodafo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/lejekenalo.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/eviction_notice_template_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caec3d21-1fcf-4dea-9aa1-d8e0b716d2b4/warhammer_fantasy_6th_edition_rulebook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62720080-12aa-427f-9993-e700ffcd9a17/dyson_dc28_hose_repair.pdfIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_5247b71f177c4d3aa9bbc11142b56609.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_25a162c3ec06422b94e6134c0ccf968d.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_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 5720 bytes
SHA-256: 10022275f455ca4905a31d658f22668932c17584997cb8915c9db19428b11f4a
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 10896 bytes
SHA-256: 8c8a691fe2b869702f22ce810c951133b0094640e64e2021363b32b0931bbd73