Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5c038a1d38724e…

MALICIOUS

PDF

84.0 KB Created: 2021-03-29 07:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a198aab634e312688e7ba05aa0f11eef SHA-1: 2e84550cbc26305cb7c48fe5751c47322110bb2c SHA-256: 9d5c038a1d38724e4544a7f161f3984ecfc5130aecc335e3e993a832196f0a40
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are obfuscated with numeric slugs, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or content-luring attack.

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://jumiwimov.ru/aws?utm_term=standard+normal+distribution+z+table+calculator
    • https://cdn.sqhk.co/saligoliti/djjB9gc/lorivifovesarimivijagixi.pdf
    • http://rabevazilogu.iblogger.org/p90x_program_schedule.pdf
    • https://cdn.sqhk.co/sebetite/Ojdjdhf/current_world_leaders_political_compass.pdf
    • http://makukenumeg.22web.org/nice_words_that_start_with_k_in_spanish.pdf
    • https://cdn.sqhk.co/tivinarafuvu/1jgtghD/searching_movie_streaming_services.pdf
    • http://pomanonorajalam.22web.org/ahmedabad_mirror_epaper_yesterday_download.pdf
    • https://cdn.sqhk.co/mamozinuba/giNGWib/rezer.pdf
    • https://cdn.sqhk.co/metexemoraga/dZ2hacT/u_miami_tuition.pdf
    • https://cdn.sqhk.co/vegedusovo/gmNkljj/77668481670.pdf
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/zedakati.pdf
    • https://cdn.sqhk.co/sorubajuzoxe/TRggiyT/bloody_bastards_apk_mod.pdf
    • http://purubifo.medianewsonline.com/musculoskeletal_anatomy_colouring_book.pdf
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/venubokununedi-sukozogew-xavewujavaseni-wijebewidefero.pdf
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/2566117.pdf
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/3740accb8795.pdf
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/raxivigi_zisatomavu.pdf
    • https://cdn.sqhk.co/kedetofido/hesgcih/fagigijete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://venukugikek.rf.gd/xukowebodo.pdf
    • http://gitodake.myartsonline.com/what_is_the_mode_median_mean_and_range_in_math.pdf
    • http://wegoxoxajenugol.rf.gd/dowakivutifesipiw.pdf
    • http://fufagarafe.epizy.com/best_3d_android_games_2018_offline.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin
a3b4d5c115f1844308b3c61c400529e33c308f0d0770e010b2e03a86db9fad45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5376 bytes
font_01_sfnt_off000104aa.bin
69be6f47c9f9eeb4c8b8dd1a1091acee60953d502397c5a4ac991f53b314d5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 11896 bytes
font_02_sfnt_off00012d34.bin
c20296e0343c882b284c2ce760230514cdd94a54be6f0440818bb95ddeae0f7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16112 bytes

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