Malicious PDF — malware analysis report

Static analysis result for SHA-256 7403b7995c60a013…

MALICIOUS

PDF

88.9 KB Created: 2021-03-22 22:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c119540f39d1e94b676699f1f128c9be SHA-1: 77fa6c407cde7ff8a7e1905fe48630a4492d04c0 SHA-256: 7403b7995c60a013d83f1154ee6226e07a223be603fe38f0beb2c484feef21fa
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 to PDF files with numeric slugs, indicating a link farm or SEO spamming technique. One of the primary external links points to a URL that is likely part of this scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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://botokaw.ru/123?utm_term=convert+cheat+sheet
    • https://cdn.sqhk.co/jukowejazus/jcjjVgi/84453429820.pdf
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/pubidepel_riwifoxar_fuporufexoli.pdf
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/sedepabevizuka_vigiligi_xiwukeju_gujejusebox.pdf
    • http://fesavuxofogegil.iblogger.org/17079167570.pdf
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/bofinutij.pdf
    • https://cdn.sqhk.co/moxawitab/gh5iaso/seeds_for_minecraft_pe_jungle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f39e4c26-2f95-4039-9927-edb59ea64339/bakepoj.pdf
    • https://s3.amazonaws.com/zumomasugipeno/ponuwutapenifi.pdf
    • https://uploads.strikinglycdn.com/files/8d8311ea-6692-4780-bfb1-6f1ea6490d92/lobenopu.pdf
    • https://s3.amazonaws.com/xirixepo/44716143970.pdf
    • http://dazatekuzos.epizy.com/hard_return_and_soft_return_meaning.pdf
    • http://liwumulexajuvi.epizy.com/baixar_app_mercado_livre_para_android.pdf
    • http://xosekipile.rf.gd/algoritmos_matematicos_ejemplos.pdf
    • https://s3.amazonaws.com/fosalizuzu/wodemutekevasofu.pdf
    • https://s3.amazonaws.com/kavalukato/29421174360.pdf
    • https://uploads.strikinglycdn.com/files/68405661-9963-47b1-a279-59f3ef92ec6f/how_to_find_out_what_generation_kindle_fire_i_have.pdf
    • https://uploads.strikinglycdn.com/files/bbc54eab-e318-46d0-a084-01580fed9f35/23299207783.pdf
    • https://uploads.strikinglycdn.com/files/d9b9f9ea-e3b4-415c-a3e3-39f2d0fc8acf/panasonic_kx-tga101s_telephone_user_manual.pdf
    • https://s3.amazonaws.com/sojuravewi/gekadagotobuf.pdf
    • https://s3.amazonaws.com/feborobegibew/film_badlapur_full_movie.pdf
    • https://s3.amazonaws.com/wobuzisibal/mainsheet_traveler_kit.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_off00011dd3.bin
6ba509462c2756c078c0f7ac2a67b9b9c5bc61b0b5861b5a3098d104a8e93acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 4820 bytes
font_01_sfnt_off00012e2f.bin
4da17b6002ab779f5f3d6e681dd03045c1b8c5ab6b970a0c960e0c1df31a5866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 11844 bytes

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