Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd5376f91648cbb…

MALICIOUS

PDF

88.2 KB Created: 2021-03-10 03:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e70dc9c3e11389c55e3502a262a6f482 SHA-1: fdc877c58a1e394a5cf1fe5b540049ac993bc6dd SHA-256: 5dd5376f91648cbbb8b24ae9dd751e7f41f70856b08e6eb0530b28cd4756c32e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL suggesting a phishing or malware distribution lure related to educational materials. The PDF's structure and embedded links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/award?keyword=cause+and+effect+worksheets+second+grade+pdf PDF link annotation
    • http://nusowutevu.getenjoyment.net/how_to_crochet_a_hooded_scarf_on_youtube.pdfIn PDF document text
    • http://cheeronthemove.store/44288964208k3bzk.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/nosanebufilunutanetuva.pdfIn PDF document text
    • http://reweder.site/kuvezafaj1qlzp.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/wefemiwosude.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/reading_the_bible_in_120_days.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/sodoxezaxiza7pojw.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/0767d6d73.pdfIn PDF document text
    • http://abwaab.su/the_last_rung_on_the_ladderfbyj6.pdfIn PDF document text
    • http://sungo1.space/wibulixobavubepawemojad0jol.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/bonubuvuges.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/najubu/82314013371.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/topokemabiganefovotul.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/xofewuwigezetejitub.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/how_to_clean_printhead_from_canon_mx922.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/servant_leadership_greenleaf.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/tojizenibegabesutaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/kuvefumujokagoj.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/1861120031.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/eicar_test_file_mcafee.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/sogexokatekomikikeveja.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 5448 bytes
SHA-256: 679a409cffaa33489ee4257b71de4679060f903c9fe9f2c7e4bb11da7269bce3
font_01_sfnt_off0001181e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 11096 bytes
SHA-256: f5d868e1f2e3d6b1ca147a2872d27adae8aa3e1ddad6cc3e92b5dd762912c27b
font_02_sfnt_off00013db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB2 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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