Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e9bef7351d8bbf…

MALICIOUS

PDF

74.8 KB Created: 2021-06-14 00:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c5d5fb535afda9bf482833adc9ccf1a7 SHA-1: 057886b5f2df882c7c85c5164d19acdde7389ad1 SHA-256: 88e9bef7351d8bbf7b7c84ad145afa745b62bcf2a2e55623cd35553b9ad84bcc
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to other PDF documents. The primary URL suggests a lure for downloading game-related files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=splinter+cell+conviction+apk+obb+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fd3c6fe00ae7.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/ccf87.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464529/normal_60b3920f9584a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60bbb07a2a01c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5fee1e4ae5567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_601215f7d11fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_603da74507cfa.pdfIn PDF document text
    • https://kuxanumukamizat.weebly.com/uploads/1/3/4/4/134489101/wimovafajif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6027c0e8acd3f.pdfIn PDF document text
    • https://vikalixasu.weebly.com/uploads/1/3/4/6/134631782/juzozunavivepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_60427ade9168f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_6007a9cec8bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fd987b6d3472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5ff4dcb480e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470967/normal_6052aa090b46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_603e8f95bf9b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/f/69726041309.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144714666/27793563719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23cd8fe-b82e-4d2b-ad40-d2d21afcf74a/can_you_return_a_tv_without_the_box_at_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a51b15-9d91-4ccf-a439-85d238e712d8/29215469834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b177cf20-ab77-4034-8fc6-846aecc0fbe1/daxasibodesubakokifapa.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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 5348 bytes
SHA-256: a828defb9324fb4334907b726e48020f2cba3d301ca20d05967bd4342d7204f3
font_01_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10880 bytes
SHA-256: 1d289f523c10c4b81ba561eea26f7f8d629abe63f76ad9010d4d4d4815bca1f1