Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fee7a4ec8f0dff2…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 18:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4082d87f937ab543645bccc48ff196d8 SHA-1: ebf66f4c55031265bc03af3d251c3cbd8f08439d SHA-256: 5fee7a4ec8f0dff2589220d860fef799f78c19d66dae42fc9ce600b9f7dfd43a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest this document is used to drive traffic to potentially malicious or spam-related websites, likely as part of a phishing or SEO poisoning campaign.

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://seumenha.ru/award?keyword=economic+importance+of+arthropoda+pdf
    • https://cdn.sqhk.co/jafiwimeg/ahaT3gf/alu_elements_definition_biology.pdf
    • https://cdn.sqhk.co/luwibajik/edk5NgN/wigodosofugufizisaj.pdf
    • https://cdn.sqhk.co/lewoxiguj/afidygf/world_cup_soccer_games_online_unblocked.pdf
    • http://finofubamu.mygamesonline.org/fedinobapeputaxefawusakuk.pdf
    • https://cdn.sqhk.co/wazafanez/6g2Kzhe/9951344295.pdf
    • http://xonitaj.mywebcommunity.org/dibumo.pdf
    • https://cdn.sqhk.co/bepigulusibe/X8hfy4V/new_latest_ringtone_punjabi_2019_free_download.pdf
    • https://cdn.sqhk.co/pimibopugugo/hZNPrjh/96307209759.pdf
    • https://cdn.sqhk.co/wofikubid/Dt1hdjf/rudomolinimami.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jobavo/christmas_shapes_photoshop.pdf
    • https://s3.amazonaws.com/juvosi/ethical_fashion_report_zara.pdf
    • https://uploads.strikinglycdn.com/files/37caaff7-20d5-403d-a953-80bcc5b07cb9/total_gym_actually_work.pdf
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_551229d70b8145548e5eb8873a4bde23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a8edcb9a-0b05-4999-a5d9-d5aaee0400ab/fakusodumukus.pdf
    • https://uploads.strikinglycdn.com/files/27573235-5e86-4aa3-8d7d-02e305426ded/sarah_plain_and_tall_skylark_full_movie_online_free.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/74577151794.pdf
    • http://xogijowag.onlinewebshop.net/22035154640.pdf
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_b93e88d481a340768978c95f870fc1da.pdf?index=true
    • https://uploads.strikinglycdn.com/files/786e04c8-8069-4679-b8a1-07d8adb01f79/who_is_raina_telgemeier_sister.pdf
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_8a7a33bdba204bac80c44deeb0d9d20c.pdf?index=true
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_9004f4ad18bd4105901f29a4a5624ee8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/842f983d-5654-4ebf-a947-688923d58fcd/does_logitech_k360_work_with_mac.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_off0000f081.bin
66175df9c8f6bd1bc378cfd6189b1f7f5fb6971e818d8c1f593f153a3e177e15
pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5144 bytes
font_01_sfnt_off000101e1.bin
1a32b7991d3cdb81d5ae8049e2cea29449957f4623e2320a181f319d1788da4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 10376 bytes