Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c436a9dd6266d7…

MALICIOUS

PDF

68.5 KB Created: 2021-01-11 19:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cbcf29abef1c2483b39238671c4a68d0 SHA-1: bb367ac4aa3c3ffd7567e27e2634e9820d5f4b6c SHA-256: 28c436a9dd6266d712d1d7188c7c2efadae5b7b0af6aa7a30a37b7ca812d96d4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/123?utm_term=love+is+fallacy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fb7179eaee7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f90cfa72bb3e.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/3f00ce4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_5fe811a0d8041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fe4d2b1b6a84.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/rerorogixovugonu.pdfIn PDF document text
    • https://vuduleputasi.weebly.com/uploads/1/3/4/4/134488699/befudovekawiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f98d58158f6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/salade/cushaw_squash_planting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/my_registration_sheet_ut.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/gipevega.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/lsd_25_grow_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FE 4484 bytes
SHA-256: f61e4b784cbb3d7280e08e0ac29653fb0fe4f929c95aec30334c7bdc2302e76e
font_01_sfnt_off0000d254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD254 11024 bytes
SHA-256: 0127f90db831aeccdee92c161f8761df82bb1bf45d67d135aca25e0dbfe6cd63
font_02_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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