Malicious PDF — malware analysis report

Static analysis result for SHA-256 8384b3016fd0c679…

MALICIOUS

PDF

68.8 KB Created: 2021-03-23 06:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b153f57f156c3fe1eb4a4ade28655247 SHA-1: 546cde1f060365b4ba7be4f67604063a08d92120 SHA-256: 8384b3016fd0c679f2e1172942ab83261c5d319e047ef41586ee8bfcd48f8375
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://fokemale.ru/award?keyword=anemia+por+deficit+de+hierro+pdf PDF link annotation
    • http://xviiivbgz.com/932136887533tt18.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/dawazajejeke.pdfIn PDF document text
    • https://nanijufofif.weebly.com/uploads/1/3/3/9/133999758/f1c73bbe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_600bf85f7bf6b.pdfIn PDF document text
    • http://fenuxove.22web.org/39737241852.pdfIn PDF document text
    • http://profyhouse.ru/how_to_get_your_facebook_business_page_more_likes6zjf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_6011b41641b4c.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/bobem_julosijor_noxoko.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/nuruvapozixix/wagokozupuso.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_731f95ed22614fd1bfb0759ea06ef674.pdf?index=trueIn PDF document text
    • http://xifetevorexuv.rf.gd/le_da_una_cachetada_a_reportero.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_3b2fedeb600d4bdd8c8d4ea4e8fd4734.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipinib/ap_grama_sachivalayam_model_papers_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/9th_class_date_sheet_bise_sargodha_2019.pdfIn PDF document text
    • http://xivonopegag.epizy.com/32442104895.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_c46f50dd837a4aac8a725c1a20055891.pdf?index=trueIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_751d797cf71744cc99b8983241a57d13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/rubber_stamp_template_illustrator.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_8fdaa83278554bc5a44096ef6975704c.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_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 5176 bytes
SHA-256: 11d4077c6f6490fcd2e9bdf9410edf29a83632cb7c0b6db786fd2ac623ae4e32
font_01_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 11524 bytes
SHA-256: d11e0ae29defe34c73a28b4019b4674c96845a29acaec480e22d3732caf4ae75

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