Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb53a2ce831dd6d4…

MALICIOUS

PDF

89.0 KB Created: 2021-02-12 09:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a5e61e1e7ec2ac23e907ef629d36301c SHA-1: eb9788c4351ac7fb8659b76e8fcea9d663625746 SHA-256: eb53a2ce831dd6d4b34786072a6eda03b54809e1f86ea031b3bb0190a92b0853
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=brainstorm+ben+10+alien PDF link annotation
    • http://rojemop.iblogger.org/file_dwg_in_online.pdfIn PDF document text
    • http://naturaitalia.space/sovtek_mig_100_schematicapmwg.pdfIn PDF document text
    • https://cdn.sqhk.co/vakamuzawa/hhfghhi/nurumivonojapuvigabowifu.pdfIn PDF document text
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/rukanom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffbf2a5b8259.pdfIn PDF document text
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/gizokunurine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fdc750a17c26.pdfIn PDF document text
    • http://hookup153.fun/drunkn_bar_fight_psvr_update_2019al68a.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/1516073f.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/rowaz.pdfIn PDF document text
    • http://arbitestpark.xyz/verilesv8juu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luselobek.epizy.com/zafenusiwomaz.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/61383855259.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/wirota.pdfIn PDF document text
    • http://tumaselopewebu.rf.gd/68054741571.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/sales_manager_performance_appraisal_examples.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 4904 bytes
SHA-256: caaaff2bb56671c205ba3b67f84aa7685d94f18e5316f47d3bfe19850b16334f
font_01_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 5216 bytes
SHA-256: dc02e46b516f1f151e5f9dfb24ee5bae612a3bc8eaee9998d83717f8d31ac8b1
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 12520 bytes
SHA-256: 7c266bcbb9b3f235625c4fdcc22a02629587b8ee29c68dc35f57f1fcde43f558
font_03_sfnt_off00013e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E93 16996 bytes
SHA-256: b0120def0974e65a072c1776d829ff72438911b61f650e475d51174c961d41ee

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