Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a98a37f79900048…

MALICIOUS

PDF

89.3 KB Created: 2021-04-01 16:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1f2781706a245b110ea8bd5dd371528 SHA-1: 2184dc9b467d1eb334fd649ca844a2afb172f4b5 SHA-256: 5a98a37f79900048971669cf0d6e5ddccd581b3d13ccb4a23716e36fe8a965fc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is a phishing or redirector document. It contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors, designed to lead users to harmful content. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=electron+dot+structure+practice+worksheet In PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/sokowurowifas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ffdd3abad925.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/89956250843.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/202999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ff4c4e457f68.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/5e66793d4b.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/atorvastatin_vs_rosuvastatin.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/why_is_my_printer_power_light_flashing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_601ddc5095007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5ff17d30a3258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_60613fbb5a1c3.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/rinodijebitijuzubopiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/26504729836.pdfIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_e3732168c22f45d89a8c73945f4d7f4b.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_7a376a9334b441fca33ddd3d7b8b252a.pdf?index=trueIn PDF document text
    • http://fezibebub.rf.gd/gramatica_inglesa_avanzada_mejor_libro.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/interpret_technical_drawing.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_65fe23758d0c4694a0f4afe247c6b927.pdf?index=trueIn PDF document text
    • http://pevurevakube.rf.gd/gazetka_kaufland_bydgoszcz.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_f97264f9d1db4fddb4d754a79e961535.pdf?index=trueIn PDF document text
    • http://toxiwudogosos.epizy.com/dusasuneko.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_66ea8d865ac54dda987565c284f4c982.pdf?index=trueIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_a6c5e5b11a97445cb2043bfceec68cc2.pdf?index=trueIn 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_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 5276 bytes
SHA-256: b9b5a0b89920efc4ebb785c88759bfbfde79de24996ad887172257b6cf8b46e1
font_01_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 11660 bytes
SHA-256: a66104c4030af43663aa042bc33262b33db6c87d3ba8ecef5788173e55f15255
font_02_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 16156 bytes
SHA-256: 1c35358e934a8c4c2b8c52c85a615dc57553e58944af0a7af039c24cdecf7ea0