Malicious PDF — malware analysis report

Static analysis result for SHA-256 2755b4afa4a41ce5…

MALICIOUS

PDF

78.7 KB Created: 2020-11-11 05:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1d017daca95606eb0fd465a4fa9bed9 SHA-1: 1fe3b94d9be4a3c1fc59fd3cce585164cb74e47b SHA-256: 2755b4afa4a41ce5dba2356a338b7d0e7d76e9fb63a0f11fb7becc3deca61499
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://cctraff.ru/123?keyword=uni+t+ut210e+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f87889b156ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f892f0b6a46a.pdfIn PDF document text
    • https://zagarete.weebly.com/uploads/1/3/4/6/134687236/xafojonuloloxa_xidavoxubed.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/linipafitewomerujufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_5f8f493cbea99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f9626a130640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_5fa9328547c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fa2bd1840716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f897d127c94e.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/saziwijaxodav/wemaboxupe.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/meditation_practices.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 2828 bytes
SHA-256: eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4
font_01_sfnt_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 4876 bytes
SHA-256: 308ba71b97d9a15ca1a3c4331f3ca649a2e0ef66bac0d4bc46b3aa75372ef2a0
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 11900 bytes
SHA-256: 6fdb44f276820a34ce446f7c033059dd5aa17bba52eee7dda26356465c584f64
font_03_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16416 bytes
SHA-256: cd66993efde932d4fe440a11da30366e66e5df0da4a21eeefe0eb23a2a825c6d

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