Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e84f1e51c1b688…

MALICIOUS

PDF

77.4 KB Created: 2021-02-18 17:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5be4e9c178f263af6ec4ce71b0122eed SHA-1: 3c350ee28b6f30b0576ade5d0ddf849816d3ddde SHA-256: 86e84f1e51c1b688235e03c1edb91f9fd74af48fd9232756b54e65691428b34f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to drive traffic to potentially harmful sites.

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://leonvi.ru/strik?utm_term=porque+cuando+como+me+mareo PDF link annotation
    • http://cosmicgig.com/66267557889278i2.pdfIn PDF document text
    • http://womenalikumat.22web.org/63966948858.pdfIn PDF document text
    • http://lg-copyrightforms.com/net_framework_2._0_32_biteawhx.pdfIn PDF document text
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/fovogegafonatoxapet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446147/normal_5fe21dbc87868.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/gezimuxunuzamebufutasunu.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/buzuvisofipodo.pdfIn PDF document text
    • http://rimka.xyz/macbeth_short_answer_study_questionsztfjm.pdfIn PDF document text
    • http://detonic-deutschland.website/bulikonojenewogaret3gjfg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_5fec398a6607a.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/pewap_sativumutax_wijivipukedivi.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/koroxeluvuroki.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/ef746e4824c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fec15e98435b.pdfIn PDF document text
    • http://trelon.fun/neumonia_neonatal_20187ydzc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludezowitupaxel.rf.gd/how_much_do_a_banquet_server.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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 5004 bytes
SHA-256: 5a4396a14420b2d5ace070ae2fa4f5286783a9df4d2d35165886ddf23b277ad4
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 11424 bytes
SHA-256: dca3c7c55d98ebed160cf37d36c1a65d8429cddf0426d66bf3eb0284886ee760

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