Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7b55fba14ca7d3…

MALICIOUS

PDF

89.1 KB Created: 2021-02-24 16:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7f90e41167bc6da0d61c53d9a9d82f3 SHA-1: 696f72b9539829aa244b1a48994c5672ffd89739 SHA-256: 4d7b55fba14ca7d3a6ff848f1f3d33ab6dc3c9e4baa3b6227d7bdc992f141af3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing content other than a title about tree sap, which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=is+tree+sap+biotic+or+abiotic PDF link annotation
    • http://jekeluxuto.mywebcommunity.org/41301688316.pdfIn PDF document text
    • http://xifotole.iblogger.org/appleton_academy_uniform.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/88848118354.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cDqSkmn/snapchat_support_email_address.pdfIn PDF document text
    • https://cdn.sqhk.co/zabadiripo/giyhijh/download_asphalt_8_for_pc_without_bluestacks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_601ae3b739251.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/fhjZicP/tikazupif.pdfIn PDF document text
    • http://domastmsk.space/nofufexiboliralerozewulut1uy7m.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/42535558692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_601157c18bef8.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/jazBRjd/lefapafopibokavuvasusuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458622/normal_602939dc36de3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5ffccb764e2a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6012270ec54ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://novezepif.rf.gd/bejoxop.pdfIn PDF document text
    • http://peburameg.epizy.com/josejezamarufop.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/pexak.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_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 4972 bytes
SHA-256: 14c4777ea67c3f7c153f17ea7f364cdd28d1b44b2bb2839812f4cc3c35718e09
font_01_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 10032 bytes
SHA-256: 2655a96116fe3a2369f3654d1ab88553c574f89a8a37cd816776162faf7b0aea

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