Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc24e57dc554a251…

MALICIOUS

PDF

59.6 KB Created: 2020-11-21 11:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6513db0ace5220cac56a103889dc4f7 SHA-1: 1c141c45b78faba509c60d3195f27c7d19a91da6 SHA-256: dc24e57dc554a25151eb193b473b0ccff4709ff1b8a0688123bd8d00b7fd2385
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic firings indicate the document is designed to link to a large number of external PDFs, likely as part of a link farm or to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious activity, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=condivo+14+shorts
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f90fd54e916f.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/gekimujam_vemipinixikoko_juxewuzini.pdf
    • https://mebudowafiwene.weebly.com/uploads/1/3/4/6/134629245/c47c147f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gebukil/38305405408.pdf
    • https://s3.amazonaws.com/dazemi/vitraxyn_customer_support.pdf
    • https://uploads.strikinglycdn.com/files/73800154-6f37-4286-8557-d7bd39d70cc7/dna_transcription_worksheet.pdf
    • https://s3.amazonaws.com/wujapu/8202722722.pdf
    • https://uploads.strikinglycdn.com/files/ccde90e5-0c97-4cf4-bf85-48fba8d864d2/56004590831.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/cracking_the_coding_interview_6th_edition_github.pdf
    • https://s3.amazonaws.com/felasorarabipis/punctuation_marks_in_english_grammar_with_examples.pdf
    • https://s3.amazonaws.com/subud/personality_disorders_dsm_5.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab1b.bin
37f754108e73a7d1d887916669beedbd2a954b3b21ece1899a7a2317c909b9b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1B 4776 bytes
font_01_sfnt_off0000bb5e.bin
b95200957f98929cdebc6145d362ba3134d1da43e51a6b6062f2c0370bc68863
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 11920 bytes