Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3553c161c12e0f…

MALICIOUS

PDF

68.4 KB Created: 2021-05-31 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50525157b7db0640802862e8fcc24968 SHA-1: d2a29a59251f0b6ceb6197b290ef31d0227e91b7 SHA-256: 6d3553c161c12e0f51860c5e412a41e0c8b30d68be62b4a3762105676aecfbaa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://crophysi.ru/strik?utm_term=play+resident+evil+4+on+android', suggests a lure related to downloading a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/strik?utm_term=play+resident+evil+4+on+android
    • https://cdn-cms.f-static.net/uploads/4463279/normal_604da42091d40.pdf
    • https://cdn-cms.f-static.net/uploads/4472503/normal_60640d7417ee7.pdf
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd67c6dd910f.pdf
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/jebilafekugipofulek.pdf
    • https://static.s123-cdn-static.com/uploads/4417139/normal_5fe271d42d6f6.pdf
    • https://cdn-cms.f-static.net/uploads/4388280/normal_605894174d183.pdf
    • https://cdn-cms.f-static.net/uploads/4417995/normal_6047fd1c24ab0.pdf
    • https://cdn-cms.f-static.net/uploads/4383334/normal_60413127c6f55.pdf
    • https://static.s123-cdn-static.com/uploads/4378382/normal_5ff32467eb338.pdf
    • https://zemokozovoxepuj.weebly.com/uploads/1/3/0/7/130776726/2298938.pdf
    • https://cdn-cms.f-static.net/uploads/4383327/normal_606c586d96ccb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d230239-d3d5-45e5-9a58-ebfa012737e6/red_ball_4_premium_apk_free_download.pdf
    • https://uploads.strikinglycdn.com/files/fc3a8d69-1e24-4d34-9d30-e8d5f2d2ba23/skype_launcher_old_version_3._8_download.pdf
    • https://uploads.strikinglycdn.com/files/88625592-c09b-49da-99e5-952e9768ddc6/lemoti.pdf
    • https://uploads.strikinglycdn.com/files/6b304911-dd06-4f27-b85d-d3dfe4a96fe5/best_fake_gps_for_pokemon_go_android.pdf
    • https://uploads.strikinglycdn.com/files/1d934fac-b4f4-4677-b21f-0b5ed3d4e5e0/pokavurinutanada.pdf
    • https://uploads.strikinglycdn.com/files/4844b4b6-06da-4a7d-949d-74722407298b/48580990257.pdf
    • https://uploads.strikinglycdn.com/files/d152b222-93fe-408d-a246-7667e4e8ec0e/honda_radio_code_error_3.pdf
    • https://uploads.strikinglycdn.com/files/05e693ba-ccdc-47c2-860b-30a82bccc631/el_nombre_de_la_rosa_pelicula_online_subtitulada.pdf
    • https://uploads.strikinglycdn.com/files/522585d2-b2a7-4ac1-8081-b2a97b349e44/dell_inspiron_n7110_charger.pdf
    • https://uploads.strikinglycdn.com/files/92ce19b7-d93b-4d25-b797-2e0fb66cb93a/was_forrest_fenns_treasure_found_2019.pdf
    • https://uploads.strikinglycdn.com/files/ed08b566-afb0-4e03-996c-cb48eabc1178/sony_mdr_rf985rk_price_in_india.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_off0000cd8e.bin
027848e1ba4e1e1afc59e46cc3376dbfa97f9802234b0b379f743a3dd902ed34
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 5072 bytes
font_01_sfnt_off0000deec.bin
00b9a6404f1082ebd236bb9eb8e770769636f62a74a166dfd06d5f6670477a44
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 10860 bytes