Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81cde16ea955b2a…

MALICIOUS

PDF

83.0 KB Created: 2021-06-10 01:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 45bf51186856ec10755328b9d305f779 SHA-1: 1f2ee94605f62c0a1261bb65a47160193bf02e79 SHA-256: b81cde16ea955b2af91e1bb13c7d770243e9e28d142e761139e7afdbba054790
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://crysiq.ru/pbw?utm_term=tu+kahide+i+love+you+all+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5ff785176e57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_6034c00f0d3cd.pdfIn PDF document text
    • https://mipijanifubu.weebly.com/uploads/1/3/0/7/130739658/refutad_favidituwozaf_texosa_furike.pdfIn PDF document text
    • https://xudapugi.weebly.com/uploads/1/3/4/7/134702609/kebiso_kofubukodi_welozonezunep.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/5972866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fe463dd38eec.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/ae992b3ee2.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/bipumedaj-modudide-mogegiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_600f9dba7554d.pdfIn PDF document text
    • https://pupamunapuk.weebly.com/uploads/1/3/4/6/134617401/bozaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_60c0f70ee1aa2.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/ruluwiwep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_6008a6642a8ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_60ba87569f308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_605aa02eb324d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunixove.pbworks.com/f/kigena.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144627282/81850739456.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/which_is_not_an_example_of_an_isometric_contraction.pdfIn PDF document text
    • http://tagiruxot.pbworks.com/f/19945106230.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/vaxusovidasasax.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144426852/punctuation_worksheet_for_class_3_with_answers.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144459534/93532961237.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_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5164 bytes
SHA-256: 99a311c614cef27268dba4dd5ca35ec3dcc399b6773bacf915f257cff1ebb1e4
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 12192 bytes
SHA-256: dd8d24c58c39e47db6a472eefcb887ef15118c032e86b9fa10e63503f3490bab

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