Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f48c7812b88b47…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 04:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7bb3fd09da8234f234f1693dd834ff6f SHA-1: 2661fb4019cf6fd043dc88f69334d8fe37410acc SHA-256: e5f48c7812b88b47f1e0b68624b241b396ae20c35352fc73f1ff4137f6cc9010
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL related to counting words in Excel, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://jacksth.ru/123?utm_term=how+to+count+no+of+words+in+excel PDF link annotation
    • https://cdn.sqhk.co/jeporikate/hfjgjFW/13573529259.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/ifhaTjf/60851514688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fdf3291b4aa8.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/Fgdhb0K/fuxen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_6004779e6545e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421937/normal_5fe4e2ffa688e.pdfIn PDF document text
    • http://itactical.xyz/kanmani_baby_songs_in_tamil4es6e.pdfIn PDF document text
    • http://you-bestshop.xyz/gekowapoxv28ey.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/Qgkhcia/rusty_bucket_back_bling.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/ChdL4PD/juvawawoxuvidolupomofasak.pdfIn PDF document text
    • http://kamaz-ftc.com/4671043474m7er4.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/Dijjijh/oscar_health_plan_of_california_reviews.pdfIn PDF document text
    • http://indital.fun/amma_amma_song_ringtone_telugu4j8bq.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/sojuravewi/application_of_probability_in_computer_science.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/digestive_system_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/eclipse_javascript_editor_formatter.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/81571821554.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/menagazep.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/chafta_certificate_of_origin_form.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 4928 bytes
SHA-256: 84b4f6419b548781b8d85a84d7faad039d0b1e58e6ecdb4bb9c35ac2baceca9e
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10120 bytes
SHA-256: fff16d59d2e72a65bffd9833f13cc80fe6c3a86b45df3171b1ecdad5ae710959

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