Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2a635937fdfbea…

MALICIOUS

PDF

74.4 KB Created: 2021-04-29 03:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6d6e7d861a475241b768f717e6778954 SHA-1: b055249e8e58fd9105de2ec28502155871b7c94f SHA-256: 5d2a635937fdfbea7fbb00783d0a3cea0974b2c7672c67d56f1e45298fd70fa5
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 0.9999

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://baarspo.ru/strik?utm_term=sex+positions+to+reduce+risk+of+uti PDF link annotation
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/zuperesasojula.pdfIn PDF document text
    • http://damewonuseba.sportsontheweb.net/bet_surface_area_measurement.pdfIn PDF document text
    • http://wanezus.scienceontheweb.net/college_application_timeline.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/61d1a8b36ef36a.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/zidosozawok/15389447291.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/god_of_war_the_mountain_100_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/nimorakipujovakabu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/fuselilugija.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/13756444422.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/juwowitutoforuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2cbb40-d34e-4725-bd13-7349720c57e5/kenmore_automatic_washer_model_110_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/42428855323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc500a2-085c-4931-92d5-0891f4d9be48/apes_usmc_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/someboxupegiva.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/mvc_ajax_submit_form_with_file.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/mumoruxizajelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed1c3d4-7f0c-4da1-8dd9-97fccda4a578/zonelejoxenewafunoxef.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/81680644996.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 5144 bytes
SHA-256: 0278b3f839ef5817a163771abd30b0a4c9ed0c4bf81f25c19b4f0b0d07a59d18
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10304 bytes
SHA-256: 982e423ad590544c69d6e475e77dcd905dbccd3209bd9ec241f6d379738d33d5

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