Malicious PDF — malware analysis report

Static analysis result for SHA-256 498d73f533d3a889…

MALICIOUS

PDF

81.5 KB Created: 2021-04-08 17:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f14e3e56752640f202e69e12ecb9f8fe SHA-1: 8e9bfda04a450372d8206ae6142411f56b42d9dd SHA-256: 498d73f533d3a8893d8eba2cadfd4c409ea4b3538e3f7d162571354731ef7bd6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for SEO manipulation or phishing. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains text related to job opportunities, suggesting a lure to entice users to click on the malicious links.

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://baarspo.ru/strik?utm_term=marketing+executive+jobs+for+freshers PDF link annotation
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/8806666.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/dhfLij6/42396002183.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/cbqhhhf/27746376406.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/ecde7ee2bf69.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/rogiselawifefid.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/zefugevasuziv.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/dUibQig/cash_flow_management_template_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusijaxux.rf.gd/weber_smokey_mountain_cooker_18_inch_smoker.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_582c2648bd7d498a824800b671fbe855.pdf?index=trueIn PDF document text
    • http://wikeratofi.epizy.com/budistas_tibetanos.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_765d5430dced447894122940ea37a973.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_df59237b4cff425e84dbede391e1ff46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/out_of_office_funny_template.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/escape_room_answers_level_149.pdfIn PDF document text
    • http://saxuvoluzoz.epizy.com/48475964772.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_5a01951adce54e209f13828a209feeae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/dell_v313w_ink_cartridges_series_21.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_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 5524 bytes
SHA-256: 48144d828165ff54d41efb61a3150959cff3f14e65db7767c62444ae6f13741c
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 10824 bytes
SHA-256: 704c9f45fe51de0bfa05395a8c61e66901d2cb9b142d3b266005440d661716e4

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