Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40e3b5fe2b219e9…

MALICIOUS

PDF

73.0 KB Created: 2021-01-21 15:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c5c59346f3008c99bd783c65e3878061 SHA-1: 63e105f893d80a48c5c3133acf14529bbb0f60f0 SHA-256: a40e3b5fe2b219e9acd97f64833d47fb96c64dd70a4ac05bea718e9bd33ff556
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of multiple links on disposable hosting suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://ggtraff.ru/123?utm_term=plural+of+zero+oxford+english+dictionary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5fa5794b90541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fed090dc48e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fbc73c039c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_5f961e843cbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5fc2ad61afd48.pdfIn PDF document text
    • https://site-1215985.mozfiles.com/files/1215985/dukatubabigulola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f91b5d0e6fb8.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/jaBh3jc/dixapix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fca955d5c8b2.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/g5Pibid/83273969978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f8aae197cb4b.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/uefa_champions_league_results_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/idhc9PC/dazor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5feeae7a8c9c5.pdfIn PDF document text
    • https://site-1188059.mozfiles.com/files/1188059/uncaught_error_class_numberformatter_not_found_php.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/gobafo.pdfIn PDF document text
    • https://site-1168215.mozfiles.com/files/1168215/ola_auto_booking_app.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5504 bytes
SHA-256: 5c2eb39a440b9592cd635d89feb355be9c051e02a7fa8c186b9c5d6185afd3d9
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 10776 bytes
SHA-256: 1926e657b5d0e20a3371066061786bdccfcb175ed0382b5d36e66ca45fcb5dc9

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