Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cda910ae67e94c…

MALICIOUS

PDF

62.3 KB Created: 2020-12-16 23:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090e86c9d9e3e2d738aa56179dd1cb6f SHA-1: 6ccbea12c401bffc15842df2587cfe871e989643 SHA-256: 03cda910ae67e94c875f42d2fb6a10e017664cbb2f5e360419c93bf2d343ed67
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or redirecting users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=ashrae+pocket+guide+si+pdf
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/7ce89c63.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fcdac96eb1f2.pdf
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5fc6cb364fc62.pdf
    • https://cdn-cms.f-static.net/uploads/4469634/normal_5faf389bcf0b4.pdf
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fab3b4221335.pdf
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f908ab6ba0f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fbc9e8a3-83cd-4d51-b168-9caa0c77fbd3/duxoveritusevukixena.pdf
    • https://uploads.strikinglycdn.com/files/fd7b11a9-cda8-427a-baba-ff5d703f0835/nespresso_inissia_descaling_instructions.pdf
    • https://uploads.strikinglycdn.com/files/41017b50-5042-46cf-a185-8960063cdc24/38228746565.pdf
    • https://uploads.strikinglycdn.com/files/fbf3e899-ee8d-47fc-8f7d-47f200f5a48e/o_livro_de_thoth_em_portugues.pdf
    • https://uploads.strikinglycdn.com/files/b4f0683f-3750-47d9-b943-8af7876f3b52/bixabenarulijuseledan.pdf
    • https://s3.amazonaws.com/pazifetanegapu/livro_capites_da_areia_em.pdf
    • https://s3.amazonaws.com/niporofez/27727246050.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_off0000b53f.bin
d300cff822311f2ffb14b55b97ea738702692454bb1cf31275a6588ca537f117
pdf-font-stream PDF embedded font (sfnt) at offset 0xB53F 5440 bytes
font_01_sfnt_off0000c7be.bin
68ca3fff8a24d51ce163e2fe1a3d2a4662b6837e776b694d96b91d633ca448d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 10956 bytes