Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea9adaf26e1fc5f…

MALICIOUS

PDF

123.7 KB Created: 2021-05-04 08:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c56d69cadc7c6b6ea25fc1427bb5af2 SHA-1: dd1c0568a6966a42a6d433253c21c0b404384e7b SHA-256: 6ea9adaf26e1fc5f0ca268c6ddf79e1a50d921e48f1ace73c81546d7e13a5a0f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, including a link farm, suggesting a phishing or SEO manipulation attempt. The primary URLs identified are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=air-o-swiss+7135+humidifier+not+misting
    • https://cdn.sqhk.co/wogefosa/Hwf8Iia/kotusidazutifofa.pdf
    • https://cdn.sqhk.co/wigalefu/jagjyJL/cara_bermain_multiplayer_di_city_racing_3d.pdf
    • https://cdn.sqhk.co/vetipewalu/Ag2PNgg/screen_dimmer_timer_android.pdf
    • https://cdn-cms.f-static.net/uploads/4407781/normal_600b39d589ba2.pdf
    • https://cdn-cms.f-static.net/uploads/4484156/normal_60579aebbc80b.pdf
    • https://cdn.sqhk.co/futogifoku/HVhjb6Y/moto_traffic_race_2_game_hack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_09fe99ff4ed948ae9cafbf04501692da.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_49305311f7a148e8b4dadb1210ba34da.pdf?index=true
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_5d9db6a1c441470ab95bc53f7698598c.pdf?index=true
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_5c76d14d0b4149d4945ceabebb16a313.pdf?index=true
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_584a0ae13f1e49ef8aa61b6cadcd096a.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_e427f21ee6b642e6a36d8fb6d5456d5e.pdf?index=true
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_216a6c80e4704d2097ca7d22ef43de3e.pdf?index=true
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_9b57aa9493cf42b2b7289296801ad31b.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_0fe47ae22f6c4064ad9069c7ac3f6a71.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_1a0761734ef248f59b27dd2490f9e517.pdf?index=true
    • 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_off0001a2df.bin
a7ce5f42c8c0e143be82201aa66b6f73673ff6d5cec1a36536397a1472d5ea31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DF 5612 bytes
font_01_sfnt_off0001b5f8.bin
27d373df1d5f17056d6fa4e9536c467dfdf244d9ca9009f8a4fe357a4263ca7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F8 13512 bytes

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