Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb841f1c619d1e36…

MALICIOUS

PDF

70.5 KB Created: 2020-12-20 23:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7782e94b1d8f39e9db49af9de0d5918e SHA-1: 552a6c87acb753a6bba407044d1dddcd5db7ffff SHA-256: eb841f1c619d1e3621d8b196a8a76528e84d3286a01670195d3594b75791ab6d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=macaron+cake+near+me
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/lewuziduwem-solurel-guzoji.pdf
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5fb4f6816ad14.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8c37a181133.pdf
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fdc084a3670a.pdf
    • https://cdn-cms.f-static.net/uploads/4408352/normal_5f9825c5e2da0.pdf
    • https://static.s123-cdn-static.com/uploads/4416921/normal_5fdf97d077701.pdf
    • https://cdn-cms.f-static.net/uploads/4478923/normal_5fa8aa8ed4c2b.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f9b82e5dae2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc38ae5bdb33045eed2d05a/t/5fcd0560920f47545b978299/1607271777783/nom_plante_verte_d_interieur.pdf
    • https://uploads.strikinglycdn.com/files/06b94c96-ef7b-42c0-a1cf-c4daa6a90a4c/doa_2_hardcore.pdf
    • https://uploads.strikinglycdn.com/files/c0a409b0-5848-4836-a133-782deb03d3bc/ar_tonelico_melody_of_elemia.pdf
    • https://uploads.strikinglycdn.com/files/bc10ae8f-d669-473e-ac36-b587db900e1a/vewegisamovamedusone.pdf
    • https://static1.squarespace.com/static/5fdd45c3eb685147a09c264a/t/5fdd5011f3f88b619ff28be0/1608339473875/gisozijomejefoxumuwuvekis.pdf
    • https://s3.amazonaws.com/mufukep/zeranefe.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_off0000d832.bin
67e01b301ff21565a64f2c5023ea7b518adef3530fa097d1edb3a163bd212c79
pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 4804 bytes
font_01_sfnt_off0000e880.bin
68e667874733473ef11ebce6c2b825988e7971de013638c8df66022f2e2e3bde
pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 11212 bytes