Malicious PDF — malware analysis report

Static analysis result for SHA-256 b546c66f1cc679bd…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 19:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b9efd44ef0f611ab38077646bc4da45 SHA-1: 54379098344e98e37979c6eb223a7c165d08ce8c SHA-256: b546c66f1cc679bd4167790832d650109004d78d4ff7eb0524f436d538074210
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=performance+testing+entry+criteria PDF link annotation
    • https://cdn.sqhk.co/wimedizi/highjje/fizapujagujerofukava.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/cgfm8hc/rival_knights_mod_apk_android_1.pdfIn PDF document text
    • http://eurozone.pro/comment_fusionner_des_avec_acrobat_readernppb6.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/05bbd97.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/ivdhfij/stalin_s_world_war_iii_game.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/31715751518bn35r.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/cEjenji/78116105121.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jfVBwgc/computer_wallpaper_free_hd.pdfIn PDF document text
    • http://e-sparks.ru/38395961645zcah4.pdfIn PDF document text
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/tikofevowaf_todonumobuturo_jiperowitil_wuvewinuwulabo.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jgHgjhg/52436688433.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/sekojoj.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/NzOrhhn/sorojodojasovaxexominos.pdfIn PDF document text
    • http://eliyalte.com/la_biblia_serie_capitulo_6_y_7dilh8.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/ji8Qojb/tufurozigewufavipowuw.pdfIn PDF document text
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/cf1610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_737e97a1e14143b4ae5572f536f4aa8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/rironigopibiwigod.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_58911bcb4e974e529591769672a310cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/caos_en_deponia_trophy_guide.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_4369b5ee8e344bafa09a90e6dfd7254f.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_a5979989cf554cc8be8db086fb2574ab.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 5272 bytes
SHA-256: 90fc27c959c2f87b975e1a0becb8671f2539969fc50e79dd84a3cb23fc54fd24
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 11024 bytes
SHA-256: 6efc9d4d9adf95ddaab45c03643b4d6a15442a51cb40741b923e87b848a6808e