Malicious PDF — malware analysis report

Static analysis result for SHA-256 599c7ea0bdb2d188…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 16:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f35b92c21b402d00b0148cb8bdbf0194 SHA-1: bf703542b763da607964292b891c96ba9cc75d50 SHA-256: 599c7ea0bdb2d188836aa4368685a7631028b1f4ab875e91d555f376b3d0c7d3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=plant+like+protists+worksheet PDF link annotation
    • https://cdn.sqhk.co/lekifuwixal/mg4vhic/acca_f3_lectures_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/ijfTTGz/30343706143.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/hRd8oja/gejiviwusumupe.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/hjjfjej/61510917128.pdfIn PDF document text
    • http://xojerodisus.22web.org/afro_blue_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/dSjaFlx/goat_simulator_goatz_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/biaieuz/rupep.pdfIn PDF document text
    • https://cdn.sqhk.co/rizinutix/he5iijB/54395001388.pdfIn PDF document text
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/lerakezubezazaviv.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/aw2vHhP/forgotten_realms_calendar.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/bolipuravigox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wezukep/simbolos_diagrama_de_flujo_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/2912447201.pdfIn PDF document text
    • http://tovivefi.rf.gd/quickbooks_inventory_reorder_report.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_62e3ca97280e411699984195cf1e03f1.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_32059e49d6ab440690016dbde12b46d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/2003_dodge_durango_headlights.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/15537483480.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/audacity_for_windows_7_full_version.pdfIn PDF document text
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_f94d4027872b4ac28ab2675a890dd728.pdf?index=trueIn PDF document text
    • http://golujaxi.epizy.com/komutinidut.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ee613fedf35a440290152115f9ecf3e8.pdf?index=trueIn PDF document text
    • http://rutozaduv.epizy.com/zezatupipu.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_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 5064 bytes
SHA-256: f31ab482c6125452060c11f951b62fd87c0f45f8f5de70ff16095e87efa04156
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 10776 bytes
SHA-256: 1d61fce8fd3b0d4d6a2dd5c5ce361f37444a7024f6160bb5befbc6af159589d5