Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8caad0680894b5…

MALICIOUS

PDF

86.3 KB Created: 2021-05-22 07:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c1c120fe932d1abd8e0f4ca9cb9abdff SHA-1: 89ea1bbadd46807a4effd0e3c45538d09c9949fd SHA-256: cc8caad0680894b57b69f20958dae12d1b04563f5f1aa584e6d18457e20b647e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=calculating+formula+mass+and+molar+mass+worksheet PDF link annotation
    • https://geromebazur.weebly.com/uploads/1/3/4/8/134895645/lifama-xexiwuzedu-mojuxawakawa-viruwarusob.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/maforami.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/3369762.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/nuvegojopojade_goretu_mixewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_604510e772fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5ffe2a28b2bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_604a3151a28ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484107/normal_6004871d5910d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_60354fd7d4975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_605d8a53a3d86.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/ponodex.pdfIn PDF document text
    • https://popibixa.weebly.com/uploads/1/3/4/7/134745137/cb867b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60197dd4d95b5.pdfIn PDF document text
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/gategakamulebajinupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_600c53bf08bbb.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/vumapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_605636e700dad.pdfIn PDF document text
    • https://baginemesurewis.weebly.com/uploads/1/3/1/3/131380932/liwujapetixumum_jepefaz_lufegesupo.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/telugi.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/goxupi_fotogini_panizumur_luguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5feaf09de0147.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/wovugi/android_cipher_initialization_vector.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/x509_certificate_format_pem.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/76120027511.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/buttocks_workout_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 5496 bytes
SHA-256: c80d67a30a4d6aa0c7f58c2ccb4274453e2726acc6c2b529ab31491ec1bf1175
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10784 bytes
SHA-256: ae4f788f79ed1eef9bc83fed7bd4d0cf7b7b6644f1dbbe8a282c1243c98c6d05
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 17084 bytes
SHA-256: 82c00780822a31f962a63c651f517fc76c3537c7619019488648612ccc4a54f5