Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14dce373eb1d7d9…

MALICIOUS

PDF

82.4 KB Created: 2021-03-09 21:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d86c85805554128b31073f0b65ad38d2 SHA-1: 084512db26aeb6673af41114921bd93841ba87e5 SHA-256: c14dce373eb1d7d904bb0d39bc51c79543249a0fd53d484c2b96ddda4fac2131
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a domain that appears to be part of a link farm, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/award?keyword=biografia+de+agustin+pio+barrios+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425723/normal_5fe035ab4890d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_60431597d260a.pdfIn PDF document text
    • https://cdn.sqhk.co/matezafun/nifNgiK/tasuzas.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/D8hj8ih/hepatic_portal_vein_collects_blood_from.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5fe99c2967058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00697d20-7904-44f0-a38a-994108813b3a/vedemavitese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5b7d63-b443-49ba-a017-d1654ff797d8/90398685642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ffd41c-e648-47c9-bdcc-44c752f19881/11838979356.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/fasovutikip.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/chess_games_free_for_windows_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cd10ad-8f65-4712-9ac3-4784dbfa64fd/how_to_get_a_very_alert_baby_to_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/asphalt_defects.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/58756963495.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/sipudugataw.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/sap_innovation_management_master_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/bharat_gas_mobile_no_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/24108935883.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_ef8456ca9f7044dda1311c0055672a5e.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_695131a8bc90464caa803b5112a29325.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_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 5368 bytes
SHA-256: 8b344dcedc8a04e76b86019beea29b337653746caf24aa8c922cde4125d76041
font_01_sfnt_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 11232 bytes
SHA-256: c65a0099f3a972df4e808af3c84e8df39722d1600d2b1cc530dd3e2646c39bdc

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