Malicious PDF — malware analysis report

Static analysis result for SHA-256 833c824066e85461…

MALICIOUS

PDF

77.0 KB Created: 2021-04-24 05:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10656b71eb943ee9878713ea6a868cbd SHA-1: b72d52ec1fd322c00d5ae74a2633735bb6aaf7f7 SHA-256: 833c824066e8546153ae6f5825ffa97bbee5dff93f96f025e6906574edd03966
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. 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 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://golowaki.ru/strik?utm_term=intro+to+machine+learning+cmu+10601 PDF link annotation
    • http://zigodijod.iblogger.org/surface_pro_annotation.pdfIn PDF document text
    • http://betafiwes.iblogger.org/essentials_of_biostatistics_in_public_health_sullivan.pdfIn PDF document text
    • http://masito.space/blue_bossa_backing_track_150oc88y.pdfIn PDF document text
    • https://nalepigetor.weebly.com/uploads/1/3/0/9/130968958/duwilojise_wesip_letovuteluxuj.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/figugod.pdfIn PDF document text
    • https://galibemad.weebly.com/uploads/1/3/1/8/131856827/ledeg-besekuwekedo.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/sazago.pdfIn PDF document text
    • http://xafegadixugu.iblogger.org/5864425717.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/mujegake.pdfIn PDF document text
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/92067bc3310f.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/zitikibirenaru.pdfIn PDF document text
    • http://meetporte.xyz/class_11_physics_chapter_9_ncert_solutions_in_hindims4lp.pdfIn PDF document text
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/mujejewegux_duzumurabip.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/034f881c4a259.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/lafalasi-vuxowadugebe-muridumifesuzo-xegajevemuxa.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/6d1c3e131c3af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomewudixaf.epizy.com/public_finance_and_taxation_2.pdfIn PDF document text
    • http://katewamopexo.rf.gd/how_to_get_certified_to_do_eyelash_extensions_in_ohio.pdfIn PDF document text
    • http://tavewafed.epizy.com/vuejs_admin_template_free.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_off0000ebc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC5 5320 bytes
SHA-256: c9fd018c89fec433aaae149e36e5e6df1607f1d4a7675f2f903b0b90cb6fcffc
font_01_sfnt_off0000fdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB0 12080 bytes
SHA-256: b43294046840783ad9a9ec602000e8e1b23250d2e188ec7f48dcc35534d61609

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