Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca311fcfcae7516…

MALICIOUS

PDF

80.0 KB Created: 2021-04-15 09:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88846b6aa6268fa8bcb0b15ecd3cbec1 SHA-1: 0c1b257a49e7a2b94173dc2967737e49180edc08 SHA-256: 1ca311fcfcae751666978602c3897298a485b234a626a5aa2eb6fb0b81e6e4dc
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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 http://pilgrimland.com/sites/default/files/webform/resume-uploads/61975266633.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/buvonajevomowetizebijix.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/fukixuliwidopisoduzurapi.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/7486912807.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/beporu.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tuwagamutavuvefofufeniz.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dufadurelabakugozuku.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/lewuxevibonotokezesa.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/87762274679.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+setup+my+edimax+router+as+a+repeater
    • https://www.vub.be/sites/vub/files/webform/gegisikirusesikogibo.pdf
    • https://www.vub.be/sites/vub/files/webform/lijulur.pdf
    • https://campusrec.princeton.edu/system/files/webform/26909318775.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/66140853426.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/33404153997.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/fapivo.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/posilo.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/xumigisapiwonatidokababup.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/kuwidiloj.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb21.bin
f43d5f3949786d55618a60b7eae57bc31eb86b974a48b9b796134a06661a7efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 5296 bytes
font_01_sfnt_off00010d25.bin
57d116e1cd6f2fc69fa8b5a14c834796afc52dae107baf7be9ac685012597998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 11700 bytes

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