Malicious PDF — malware analysis report

Static analysis result for SHA-256 782d2716ef765ee5…

MALICIOUS

PDF

70.6 KB Created: 2021-03-20 16:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7c96044c558d6b570c9053516454979 SHA-1: d723d022e02c7d90c75e828e2e5f0d8ef8731e28 SHA-256: 782d2716ef765ee5f166d61af8885103f68479d778a37a00bb44e276bb38ac01
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains keywords related to educational exercises, likely a pretext to disguise the malicious intent of distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/aws?utm_term=ejercicios+agudas+llanas+y+esdrujulas+6+primaria+pdf
    • http://hd-cam-mirror-up1.club/metodologia_dela_investigacion_roberto_hernandez_sampierimcdjo.pdf
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/xapufa.pdf
    • http://ropiwijubasa.22web.org/maths_olympiad_book_for_class_8.pdf
    • https://dexigator.weebly.com/uploads/1/3/6/0/136049715/xuluzopa-bigudesito-risigokasabem.pdf
    • http://lifeeuro.info/silent_knight_5208_user_manualzh461.pdf
    • http://bometaximom.scienceontheweb.net/wipowowidafetu.pdf
    • https://gugamuwapubadek.weebly.com/uploads/1/3/0/7/130740318/97de1.pdf
    • http://wimixolumow.iblogger.org/confidentiality_agreement_template_south_africa_free.pdf
    • http://mp4.design/tuvatosifojigojibirkwn6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeruxaxer/46454005251.pdf
    • https://s3.amazonaws.com/visagogijulep/kisamanafup.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/53831873078.pdf
    • http://nupuzawov.onlinewebshop.net/ziwomaxubukapeta.pdf
    • https://s3.amazonaws.com/feborobegibew/wofoxawibowedamominuz.pdf
    • http://baverasoge.epizy.com/video_er_for_pc_32_bit.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/how_do_i_fix_gm_instrument_cluster.pdf
    • https://s3.amazonaws.com/visagogijulep/zuketugefifug.pdf
    • https://s3.amazonaws.com/gurafoga/apple_carplay_subaru.pdf
    • https://s3.amazonaws.com/farezelof/malignant_ascites_drainage_guidelines.pdf
    • https://s3.amazonaws.com/vedexajawo/mekofozanoz.pdf
    • https://s3.amazonaws.com/simujix/namekuwu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ca.bin
4b36926b34443977ac1686c0567737b3c96c8e6011f7930ddc4b34f9b60c58b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 5764 bytes
font_01_sfnt_off0000e76a.bin
58af2fc8259300ae29395031f35bb1f83a4ec5576bb7ce28dd19f9703d853fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 10796 bytes

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