Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa371e004e9cc81…

MALICIOUS

PDF

140.8 KB Created: 2021-03-30 00:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8e3e6d86c7b8c6e971f51d05eb77b409 SHA-1: 9c1061b68daec23c1ea5c0b416fd39d6f6ea223c SHA-256: 5fa371e004e9cc81b9334447dd902f968c57d564afd5daa9e744d36c5ae06e08
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized URLs designed to appear as legitimate content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a pattern of using link farms and redirectors to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ponafet.ru/wix?keyword=chapter+review+substances+mixtures+and+solubility+answers PDF link annotation
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/5625471.pdfIn PDF document text
    • http://karnaval.host/mx_vs_atv_reflex_cheats_unlimited_money0mdfz.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/cybrary_free_cissp_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/dell_r730_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/tajelezoja/jhfgexe/domobopakagijokofe.pdfIn PDF document text
    • http://brosbass.com/luwusomolaguvad10ii.pdfIn PDF document text
    • http://italy-small.space/53015983590d14i4.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/canon_powershot_a560_sd_card_size.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/heCheTZ/wokafefibegiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/V1zlhby/hydraulic_calculations_for_fire_sprinkler_systems.pdfIn PDF document text
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/6e34b50c640d05a.pdfIn PDF document text
    • http://lestyprin.online/41989473713ojlhb.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/88129537821.pdfIn PDF document text
    • http://citruss.space/xugumukigiduzola126x8.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/kendo_ui_grid_column_template_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/15429361246.pdfIn PDF document text
    • http://vpntop.info/tubugf3559.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/vumopavulopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/73532799932.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/paxogudifokizexerofaz.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/gr0aEBI/international_mobile_recharge_philippines.pdfIn PDF document text
    • http://hermidkovo.info/julenc1rnu.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/pawobuxotum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0DA 5680 bytes
SHA-256: a81dcec93d799bf26f629f4c60ec3a7ddee8987a6fe959dee8879a559d4c567e
font_01_sfnt_off0001e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E40F 12248 bytes
SHA-256: 7093be4dcf3e68f0b8430f4be35c5e1980954fab677b1096d5d4802876179c75
font_02_sfnt_off00020dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DC4 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357