Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b882c8799d34e14…

MALICIOUS

PDF

89.5 KB Created: 2021-05-29 17:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f42fc1cd4ac578fcbdb275b0f33eb8e SHA-1: dd31eb71eada4e01195292141d1729ccfa0f34e9 SHA-256: 7b882c8799d34e14145d5771bf62bc43faf6aed26a95f88419a5a037c7be01d0
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a 'PDF_SEO_LINK_FARM', directing users to various external PDF files and a primary URL associated with movie downloads. ClamAV and an ML classifier flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious content or phishing 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://kuzutuzo.ru/strik?utm_term=tamil+dubbed+movies+download+tamilrockers+2018
    • https://cdn-cms.f-static.net/uploads/4493920/normal_606571aacce3a.pdf
    • https://norogogobizifuk.weebly.com/uploads/1/3/2/8/132816096/eb8c12b465.pdf
    • https://cdn-cms.f-static.net/uploads/4417308/normal_606e93d61db6d.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_601d18ab3a896.pdf
    • https://ruzabipisoxo.weebly.com/uploads/1/3/4/5/134528447/rogupup.pdf
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/kamobu_remeteradisopuf_jebekomosuferar.pdf
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/domexuvexu.pdf
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/vadetumofunixo.pdf
    • https://kuzikumivinoli.weebly.com/uploads/1/3/4/2/134235757/8242724.pdf
    • https://wegizazuxiri.weebly.com/uploads/1/3/0/8/130814830/1096954.pdf
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/selolox.pdf
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/gurifoxunubarulogabe.pdf
    • https://xezudabumaku.weebly.com/uploads/1/3/4/3/134377243/f6a3d7bfeafe.pdf
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/48c00cc1375021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/b7981c65-a026-4034-9179-5d166ed58798/rakazigijuwetavu.pdf
    • https://uploads.strikinglycdn.com/files/185ed4eb-b432-4195-9795-8be461f1a888/58355033983.pdf
    • https://uploads.strikinglycdn.com/files/096a7440-ab32-47f8-8cad-300bb0b539e1/31602696649.pdf
    • https://uploads.strikinglycdn.com/files/f532a067-6702-4597-9a7a-6503e9d39efb/9355369077.pdf
    • https://uploads.strikinglycdn.com/files/608e1aec-aadb-4461-8b6f-05364a1b34d5/best_portrait_lens_for_mamiya_rz67.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_off00010e4d.bin
d07b8764e5971d40e9b74eb03e92b8cb38d4f5a1c476fdcffcf48291c32b3851
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 5908 bytes
font_01_sfnt_off00012267.bin
5411de2dc7f37ae342439e9ad82e1774454353cbaf47cdca870220711f7eefe0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12267 3280 bytes
font_02_sfnt_off00012f94.bin
87128888ab120bf8f336d513dde31c4078a9016d9903a89b9fdfb37abca31308
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 12316 bytes