Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db1e40505948a15…

MALICIOUS

PDF

79.2 KB Created: 2021-06-01 19:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0626cf3bdc7367899732a67220451346 SHA-1: 1f561496aaa2ff5acdf4e1913fbb101eff714ac5 SHA-256: 7db1e40505948a154977766f652c90e9301812d1020f0e81426c2962498b3713
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs is https://ketchas.ru/pbw?utm_term=components+of+technical+specification+document, which is likely used to drive traffic to other sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/pbw?utm_term=components+of+technical+specification+document PDF link annotation
    • https://vimopoferozure.weebly.com/uploads/1/3/4/8/134858925/lopax.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/xepeda_gajej.pdfIn PDF document text
    • https://juludonidodag.weebly.com/uploads/1/3/4/7/134706402/sotolezivol_fowitisukokobov_sanuxupox_tanuziti.pdfIn PDF document text
    • https://pugefaguza.weebly.com/uploads/1/3/5/2/135299010/8805426.pdfIn PDF document text
    • https://wimupisu.weebly.com/uploads/1/3/4/7/134753473/c417c6d.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/0fa8609728.pdfIn PDF document text
    • https://vunufifok.weebly.com/uploads/1/3/4/5/134525051/6922603.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/6f3b2769bb3214.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/sufirapokes_lalasajemu_viwawe_kaseroli.pdfIn PDF document text
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/571192cde148519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memofemovo.pbworks.com/f/proving_parallel_lines_cut_by_a_transversal_worksheet.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144441186/vunewakififed.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/my_stupid_boss_1_indoxxi.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144472401/does_tax_topic_152_mean_anything.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144411951/construction_site_visit_report_format_examples.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144415671/age_of_empires_3_complete_collection_steam_cd_key.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/42102534844.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418095/puwonirujekajuwiliw.pdfIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144457740/placas_tectonicas_del_mundo_planisferio.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425544/acres_of_diamonds_summary.pdfIn PDF document text
    • http://barumena.pbworks.com/f/24956552816.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_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 5204 bytes
SHA-256: d8339e12be35657b74a0a62e32321e7f3e71a0dc8fb1540c2f4942f6fbddefc1
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 10328 bytes
SHA-256: 3a8b33e88ac6897a20d13d09a81dffac1f305554de96cba4e3da609ff65fd069