Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16ad1a1d067d8ba…

MALICIOUS

PDF

77.5 KB Created: 2021-02-24 04:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 51dee83d215fe05dfcddffaa5f7c38ee SHA-1: cd2c6857bc2c16fd11743f163016ba3d31a0e645 SHA-256: c16ad1a1d067d8ba4580870f3b2b052bc57e9946afa650067d919fe5a8740b7c
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that redirects to a known malicious domain, likely intended to trick the user into downloading further malware or visiting a phishing site. The document body, though heavily obfuscated, contains text related to 'psychology statistics for dummies' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=psychology+statistics+for+dummies+pdf In PDF document text
    • https://cdn.sqhk.co/refevebux/gdETjhY/zufixasewefenemigujo.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/ecjd5oH/vertigo_after_having_covid.pdfIn PDF document text
    • http://detonic-ro.website/takovazixevudizoragujesiuaszv.pdfIn PDF document text
    • http://app-3null.com/kefuludilulofphekm.pdfIn PDF document text
    • https://cdn.sqhk.co/pegatorapo/zhf1ICF/gurok.pdfIn PDF document text
    • http://kungfumalibu.com/free_printable_pet_rock_adoption_certificateggfe7.pdfIn PDF document text
    • http://winoorama.site/159368284305y7z3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varoxekoduv.epizy.com/furolerusuzexono.pdfIn PDF document text
    • http://kavejanunar.epizy.com/duburutasewag.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/7276678150.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/ad_hoc_reports_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/pawitedelifab.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/jeopardy_template_for_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/23395527848.pdfIn PDF document text
    • http://ravenofudaviv.rf.gd/safety_not_guaranteed_alternate_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/writing_a_friendly_letter_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/icloud_unlocker_pro_free.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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 5672 bytes
SHA-256: dc84ec4a766758aea389471161309dbddf4b4a945c8bc7d79be50d94558fbed2
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 11148 bytes
SHA-256: 15c12fc52832bba624a2e49d9864e7b39eb8b301120c9f42c46f00ecaf2521f1

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