Malicious PDF — malware analysis report

Static analysis result for SHA-256 0178d143d31e1ec6…

MALICIOUS

PDF

73.1 KB Created: 2021-05-20 17:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 012f19fb28fd6986eb1c133660a74ad4 SHA-1: 4a4ead7dd40630960a085257337c8a2c53ed8091 SHA-256: 0178d143d31e1ec60e51cfa0e4d042973fd325b9e9c956b3020f3282f31341d5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'php html to image script', aligning with the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leloturopuroka.weebly.com/uploads/1/3/5/9/135956930/mukowuwiregoboberog.pdf In PDF document text
    • https://pekupepavipojev.weebly.com/uploads/1/3/1/8/131872203/rezafusojeminoziwo.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/8966368.pdfIn PDF document text
    • https://bujugumaxu.weebly.com/uploads/1/3/4/0/134096797/vejibizowusojowixuf.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/titapowot-xevuwew-bunivuzoserit-xerufed.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/tepugunaxulasulex.pdfIn PDF document text
    • https://notolunezoxab.weebly.com/uploads/1/3/4/8/134846452/f474dc.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/026d8f4f7c727.pdfIn PDF document text
    • https://nazokorebuvawir.weebly.com/uploads/1/3/0/7/130776058/puwim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=php%20html%20to%20image%20scriptPDF link annotation
    • https://s3.amazonaws.com/zamemigojat/73324076718.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/google_nest_mini_2nd_generation_vs_amazon_echo_dot_4th_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/eyelash_extension_certification_class_tampa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c847592-ae23-47a8-a761-dc1263b35f88/kubamebolifazekurad.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/darudevozevipixededifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f02e57f-3dd4-49d8-91d5-732e41f60330/will_there_be_a_banana_splits_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/64598409576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac7a2af-3d38-49b9-a9ac-4dce2daed2f4/dusepokusalonur.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/42887251533.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/plataforma_educamos_colegio_pureza_de_maria_bilbao.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/sobom.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/essex_bus_route_91.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e0c94a-1d8e-44af-bc0e-613331d2334b/98749153679.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5348 bytes
SHA-256: b531bfb0d3f73b11361060524ef91c579ecbc9a3d054b67751958a9bf1cf3930
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10696 bytes
SHA-256: a4038f94cfc36bbe6bdd7bfbf197b36f3b9bd53f1d1a4cce3ab658f3a568bb3d

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