Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cf37eac87b4834…

MALICIOUS

PDF

82.9 KB Created: 2020-12-26 01:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 51e9eef896a8b5fd1250f929a69775c4 SHA-1: 156e44e59a21098870a93eda515d8e9ca5e3d1f9 SHA-256: 36cf37eac87b4834bc97bdac1f80751ca0ffdccff5860f99b783f507be1f2454
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numeric slugs pointing to PDF files, indicative of a link farm for SEO manipulation. One of the primary URLs, 'https://trafffe.ru/123?utm_term=hugtto+precure+movie', is suspicious and likely serves as a distribution point for malware or phishing content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/123?utm_term=hugtto+precure+movie PDF link annotation
    • https://cdn.sqhk.co/xanodujijefu/Fwgje4s/93991333807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5fd10165a09a2.pdfIn PDF document text
    • https://cdn.sqhk.co/rufigukuj/hijaBRQ/screen_time_control_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/jNDjbgg/5550890251.pdfIn PDF document text
    • https://cdn.sqhk.co/jibetovo/gfiihei/japan_train_simulator_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/Rahihjv/fidget_spinner_simulator_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/IYPKhgD/draw_a_stickman_sketchbook_online.pdfIn PDF document text
    • https://pugofadunenem.weebly.com/uploads/1/3/4/7/134727284/legelisofividexo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/jghaWIN/download_game_nautical_life_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/69438129389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef1f0e1-9162-4cdc-a39a-8a16c69f1fe3/young_life_house_tucson.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/google_account_login_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/idsa_guidelines_staph_bacteremia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f24b56-8e3a-4b56-a8da-91af002cc52d/89075284324.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/schedule_template_24_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/dead_by_daylight_survivor_guide_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 4652 bytes
SHA-256: e84c333a66849bd5b9cc5d80137fe505650a36d2f81c351e573579db2fd4f6b6
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 4856 bytes
SHA-256: 6019be931c3af02136ed513032dce0f2d5a389a6dd8753b8bad765ec6bfd8ed7
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 12200 bytes
SHA-256: f0471fe4760fe7e44d5b4ef472e3fd090380b9ae70f158856e9e2b15e9baf94d
font_03_sfnt_off0001277b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277B 16340 bytes
SHA-256: a0922ab513f2384d489a717a9ab4f492948f5d852e70bb2775b526b1227529e4

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