Malicious PDF — malware analysis report

Static analysis result for SHA-256 544db7ebf3f1851c…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 23:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bcbe4f94435f5bc17f9cf9a4969d16f8 SHA-1: 7a50fdd2ad2589ba24e9f28485e03b4dc2fc192d SHA-256: 544db7ebf3f1851c36f4776c34a8314eac60e5257a28cc878b083bfc251aa46a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though partially corrupted, contains text related to 'Book report examples 6th grade' and the authoring application 'wkhtmltopdf', which is used to create PDFs from HTML, potentially to disguise malicious content. The presence of embedded URLs further supports the attack pattern of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=book+report+examples+6th+grade PDF link annotation
    • https://cdn.sqhk.co/fovomesit/ixIibji/delta_bingo_live_online.pdfIn PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/b68ea.pdfIn PDF document text
    • http://gumimexolekedid.22web.org/in_feng_shui_what_is_the_best_color_for_a_bedroom.pdfIn PDF document text
    • http://50offstore.pro/rozivapixaov281.pdfIn PDF document text
    • http://rozisokotedowo.22web.org/33400731636.pdfIn PDF document text
    • https://pejegenipejixe.weebly.com/uploads/1/3/4/8/134848799/gededutuwito-telenupiko-kabipijitajob.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/jd1M7XD/small_business_loans_covid.pdfIn PDF document text
    • http://creditscorehelp.info/2008_cadillac_sts-_v_owners_manual83lf5.pdfIn PDF document text
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/kirutedixudesirokide.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/takateg/kimitaguxupamen.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/331289762.pdfIn PDF document text
    • http://bifameb.rf.gd/what_is_handcrafted_espresso_beverage_at_starbucks.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/dapupulugow.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/portable_microphone_and_speaker_for_tour_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/15468701931.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/kupobenipovilako.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/chadariya_jhini_re_jhini_lyrics.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_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 5708 bytes
SHA-256: 827522729581e823f722ae28a98d15ba2351e04b057cac05ad7652d7a97f2215
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10900 bytes
SHA-256: 1780b546944d268bae79c9a56869cc9ca6d36fed652998d3d68907aaa3772ce0

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