Malicious PDF — malware analysis report

Static analysis result for SHA-256 159878a5ee1e6967…

MALICIOUS

PDF

121.7 KB Created: 2021-05-30 11:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e3175fe2f317b591474d2dc1e8afbf6 SHA-1: 73129c32eac76055ab90eeb56dec3894a0a6c345 SHA-256: 159878a5ee1e6967812910d90b4d0adccc49d5c59137b8b415fac44f0c7fc241
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://ponafet.ru/123?utm_term=soundtrack+film+hotel+del+luna', is directly embedded. ClamAV also detected this as 'Pdf.Phishing.Trojan', indicating a malicious intent to redirect users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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://ponafet.ru/123?utm_term=soundtrack+film+hotel+del+luna
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fff3c41b8b68.pdf
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/da32f4.pdf
    • https://buwikuzajow.weebly.com/uploads/1/3/7/5/137501860/11e30b28.pdf
    • https://cdn-cms.f-static.net/uploads/4379605/normal_6022d2423728c.pdf
    • https://cdn-cms.f-static.net/uploads/4474478/normal_605fbbf0ea55f.pdf
    • https://mibaxezaju.weebly.com/uploads/1/3/4/6/134641270/libusevafujelarefad.pdf
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5fc97f0683e4f.pdf
    • https://pudupisegatijuw.weebly.com/uploads/1/3/4/6/134670509/68370d46.pdf
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fca402b14038.pdf
    • https://lonapumerupa.weebly.com/uploads/1/3/4/8/134853684/7123024.pdf
    • https://cdn-cms.f-static.net/uploads/4465941/normal_601b2539a04f0.pdf
    • https://cdn-cms.f-static.net/uploads/4491670/normal_6056f1a9a9b80.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6064adb85e672.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_6032bcb3a03c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b4c6470-bf38-4b51-8a34-6256ffc680ad/which_type_of_graph_uses_symbols_to_relate_to_data.pdf
    • https://uploads.strikinglycdn.com/files/abfce176-dfd3-4168-a818-1226d2626368/butetesumozeguboneremas.pdf
    • https://uploads.strikinglycdn.com/files/e134b7fa-857b-468a-92b7-dcb9a4ff7e41/pearson_precalculus_9th_edition_answers.pdf
    • https://uploads.strikinglycdn.com/files/1947db32-a945-4adb-8847-37ad36a0896e/which_veg_food_has_highest_protein.pdf
    • https://uploads.strikinglycdn.com/files/a97d0825-91ad-46ef-8259-f0e33925b900/foluvafuxidu.pdf
    • https://uploads.strikinglycdn.com/files/94482e51-1088-4d21-a402-2fa5927a7416/rekasidefi.pdf
    • https://uploads.strikinglycdn.com/files/5404579a-602b-47f8-a183-bfd2f97348fb/wugokojewofupavi.pdf
    • https://uploads.strikinglycdn.com/files/141bcd02-2bf2-4519-8545-038674cadae1/41501581540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013eab.bin
1e49a45605f8bde052fbebf5cffc5d7009b009f5fa00fd000e987d348f3a2fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAB 34388 bytes
font_01_sfnt_off00019dd9.bin
36517eae20894f805d3a9156bb809b435426acd243ade79ec6977eea9dd6b9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD9 5248 bytes
font_02_sfnt_off0001af8f.bin
1e08ab786653cf0f7e5c02643965917e398c5f052a00d5f0d4a4533e2e2ac7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF8F 11476 bytes