Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc4fbe20c43ef61…

MALICIOUS

PDF

90.3 KB Created: 2021-04-28 15:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0cfdfbdc8a672f358d25b3e9ffce7b8a SHA-1: e6b7345f3fcd72a5001fe43202973c682c99d73a SHA-256: 8fc4fbe20c43ef61154b7893f2b808d1fb19a93af3e8e9a6e14ef9773f931eb9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to Adobe Acrobat Pro serial numbers, a common social engineering tactic to trick users into downloading malicious content. The presence of multiple external URLs, including one flagged by ClamAV as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The 'ClickFix' heuristic further indicates that the document may instruct users to execute commands, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xajibur.ru/strik?utm_term=adobe+acrobat+x+pro+serial+number+2017 PDF link annotation
    • http://reassurez-moi-fr.info/logical_connectors_exercises_with_answersmwrd3.pdfIn PDF document text
    • http://shopsmmv.site/anisocitosis_plaquetariazx19t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5fd2277cbab9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_5ff33940c8447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_606d7ef01d004.pdfIn PDF document text
    • http://gbo.guru/xotudiranokagadaxezadeaf5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5fe5697c7e9fa.pdfIn PDF document text
    • http://medicalpracticementor.com/gmail_email_template_htmlhgbeo.pdfIn PDF document text
    • http://naturalgood.space/tamilrockers_movies_2019_madras_roc0lkf1.pdfIn PDF document text
    • http://card2card.live/how_to_charge_compressorlyuxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fd34d1cf06f7.pdfIn PDF document text
    • http://peskomment.ru/23374278664yd9ha.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/luworizesupox/amharic_version_reporter_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/carmageddon_tdr_2000_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/4978500526.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/rabesoxusumimavifafodek.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C5E 19004 bytes
SHA-256: ee07325973c47befb858de4aeaae56daa7ccbd42454c50d386f0865f794ec27c
font_00_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 5824 bytes
SHA-256: c5b66cf678140d4e640900075f2bc737c57bf5e7b0cabd9f203f2efd04edb841
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 12560 bytes
SHA-256: 97a265c431523d3db551e78081ef0e0a4407f9e5b4f4d3aedab59d86763128a0

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