Malicious PDF — malware analysis report

Static analysis result for SHA-256 082e3aa4273cb18e…

MALICIOUS

PDF

65.5 KB Created: 2020-12-02 14:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e1f9e9ad68f5349bd28e78ca3404ed9 SHA-1: d6179f21961ff0515d240d8c243a382080ef37d1 SHA-256: 082e3aa4273cb18ef9145a364530e59f1f36f7de332baa3f9267f482750059c1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/aws?utm_term=web+page+video+er+online
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/ccfdcb87e94.pdf
    • https://rezivunafotete.weebly.com/uploads/1/3/4/3/134354631/6100721.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0f22ee5c7695ca99bddc9/t/5fc27ea81972c46e3ceed487/1606581928923/story_of_icarus_and_the_sun.pdf
    • https://static1.squarespace.com/static/5fc67811085bf90c0e236a57/t/5fc6bf9d3d56556d14264063/1606860702477/79305092561.pdf
    • https://uploads.strikinglycdn.com/files/a9bccb69-be27-4341-9e52-6454553b271b/53798209456.pdf
    • https://static1.squarespace.com/static/5fc0e1846b97992eb55bfc03/t/5fc632923570fb44d1d5c4ca/1606824596192/wesikefenedakakemevedin.pdf
    • https://uploads.strikinglycdn.com/files/88c45d25-82f0-40ea-a3da-e4869008cf60/scph1001_bin_2shared.pdf
    • https://uploads.strikinglycdn.com/files/3bfe4cd2-2379-429f-8aa5-19e0f7f34140/ravoverisilejo.pdf
    • https://uploads.strikinglycdn.com/files/0574354a-e5d4-462f-aaf5-fe466dcbd9d9/xoraterinifusapepase.pdf
    • https://uploads.strikinglycdn.com/files/02996980-2eba-464d-9ebe-09c6d664e024/writing_slope_intercept_form_worksheet.pdf
    • https://static1.squarespace.com/static/5fc0f169085bf90c0efd4cbb/t/5fc1ab31f81c9a2a0ce0c007/1606527794903/86614210810.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_off0000c1b7.bin
1c4e0ab041f81ee640fefbd8231ac79c90c6d00554740e90f8a75d4da0b963f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B7 5164 bytes
font_01_sfnt_off0000d362.bin
f6a1e8bcae5d52b047f682944ef8847fa7d69d6c07a4b7649dbe65b086bdcde4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 11296 bytes