Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f60ddedc05b289…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 01:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ce6a4c4a3e85e0eaf939625c6d7a588 SHA-1: b18a14ac62bdd163bd3722a041c9cd8df0746eec SHA-256: c3f60ddedc05b289054c0816809fd11caec1af7f514144e77d37bd0c36f8d04b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=converting+customary+units+worksheet+pdf
    • https://vawosogujatu.weebly.com/uploads/1/3/5/2/135293246/bejabafa_sufoguridezozuv_sedaxozuki.pdf
    • https://fewegako.weebly.com/uploads/1/3/1/4/131453302/1809828.pdf
    • http://jivusibofonefud.mygamesonline.org/your_brain_at_work_em_portugues.pdf
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/5998312.pdf
    • https://cdn-cms.f-static.net/uploads/4416316/normal_603d0f1ea530f.pdf
    • http://tetoxukipim.getenjoyment.net/5782969037.pdf
    • https://cdn-cms.f-static.net/uploads/4428078/normal_603a98f557436.pdf
    • https://cdn-cms.f-static.net/uploads/4426261/normal_60311f4953e7a.pdf
    • http://fezusixikizagu.iblogger.org/15722874405.pdf
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fce8aea05921.pdf
    • https://vasaxufunibax.weebly.com/uploads/1/3/1/6/131606743/peloz.pdf
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6048d286367d1.pdf
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5ff94733bd116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lapetagalelan.myartsonline.com/historia_universal_libro_de_2_ao.pdf
    • http://xenegivijofawok.rf.gd/emc_powermax_2000_price.pdf
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_403336bc283b4e79a9f72a9d086ed0f0.pdf?index=true
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_aaf6ddf78244480b82dca85295ff4491.pdf?index=true
    • http://vevugep.epizy.com/lane_furniture_recliner_handle_replacement.pdf
    • http://juxugalipexobow.epizy.com/google_assistant_best_android_apps.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_bfbf13617fc74e128004e7dde5edfba2.pdf?index=true
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_c56f45713976474a8cef547befe60508.pdf?index=true
    • http://livirava.atwebpages.com/play_a_game_of_chicken_meaning.pdf
    • http://zowisoburime.rf.gd/58229133094.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_off0000e817.bin
b85dbe4263aa0ed466ee8ea1709e0de151cb27bfd288ae7d860282c88371ed3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 5760 bytes
font_01_sfnt_off0000fba7.bin
2daef32c3ce437c8ce9816c126179ba79c228026534f893e80d205ecb99e1dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10496 bytes

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