Malicious PDF — malware analysis report

Static analysis result for SHA-256 608a1cc0dcd713d0…

MALICIOUS

PDF

61.1 KB Created: 2020-12-17 21:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: effcfe6fdf3faa851931c1ce18147509 SHA-1: e0d97afe7ec6a91cb095c9c7cc045406c83466d9 SHA-256: 608a1cc0dcd713d02c8220c44c8fab54ee2a6329f47af2b8e137809f9223b34f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a link farm with numerous external links, including one pointing to known malicious redirector infrastructure. The primary malicious link is `https://cctraff.ru/strik?utm_term=synonym+for+conducted+a+study`, which is likely used to phish users or deliver further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

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://cctraff.ru/strik?utm_term=synonym+for+conducted+a+study In PDF document text
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5fcd51390dcdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5fc4fc6944453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367617/normal_5fcb8fc4702b9.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/0a5879a5173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fa20388c4c84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f875247ee741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fc9e577792d9.pdfIn PDF document text
    • https://zojusuvog.weebly.com/uploads/1/3/4/7/134762677/voreniw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f68e78-66e7-4395-91ac-2deffd0714a5/virgin_hair_fertilizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cbbf7d-e869-452b-967d-ae4461cdafa0/pobezutuk.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/calculus_of_variations_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/22836998277.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/gikeditiriwez.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/cuestionario_ser_bachiller_2018_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/matutavudubigo.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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 5340 bytes
SHA-256: 6ad82009cec6d0286d312cc3ba8f02d8effff28fba087c7b4f30f15cd39cf0a0
font_01_sfnt_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 9484 bytes
SHA-256: 9b19f32df2188e0093f1097be4237c9cd8e63a9bb4219376631e8ce312f3160c

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