Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3b5fb58131bc9c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 11:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e8e72374f7e34175b38426a8e89ee63b SHA-1: 096a1bf56857deac67539bbe3c82222f76deb97e SHA-256: ae3b5fb58131bc9c4ebe46feb64c260241a1e5f137d5b1945212ec030691005e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/award?keyword=television+advertisement+in+nigeria+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fedd55cdd5e8.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/OjGMjdA/kotiwixupazotilapajes.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/dpgjxwe/weather_live_radar_dallas.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/51MIuP4/zenonia_5_wizard_build_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/gcAgelQ/34325264992.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/iiehbge/megojewimoxasivosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60168c1f109d2.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/qyr2iiv/vinukubejexakose.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/punujakowaxabimeti.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/9710450905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3fc234-16f8-4f18-acbf-95bc2a7efd05/44828446444.pdfIn PDF document text
    • http://tinodaxaxaduj.rf.gd/bean_bag_3d_max_model_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0eb48f4-e5b9-4d43-8f47-7a659d46f4dd/principles_of_economics_mankiw_chapter_27_ppt.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/fizinozuwewabadejegaleki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78d113a-dc9d-46e2-9fd3-347ccc07aa0f/short_film_scripts_for_students_tagalog.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/komavobomexebutafano.pdfIn PDF document text
    • http://dapuvutajula.rf.gd/76968322760.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_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 5372 bytes
SHA-256: dcd7ac7e411a8cdbe060e58dff7e2e64e1aa89bf450b884d32cfe40f75ead60e
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 11512 bytes
SHA-256: 86b8404af3e77333ecfc6919ae7a496890750147a68ca94a22fa662ea6ac7587

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