Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48884e0f4921d22…

MALICIOUS

PDF

66.9 KB Created: 2021-02-16 03:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8a80496e89fa248b2e62f2d43af2495e SHA-1: 3a7fe1eba2a49529b00aff5517a84399838d288a SHA-256: c48884e0f4921d22a40a3ea26db678a374d4dab740e6806b6bd8b83b2a5d6dd1
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=flight+trainer+in+pandaria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5fda145cb8f6a.pdfIn PDF document text
    • http://hookup154.site/kuzeteloxuxudibin784.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/758287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fd7e9f33bb0b.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/BBijcaY/49524166699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_60249f4be835d.pdfIn PDF document text
    • http://reestr.site/30_day_weight_loss_diet_planvtiuh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_600f56d455ab3.pdfIn PDF document text
    • http://naturalgood.space/wijajojadudokrg4xx.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/b15f9372cb744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5fce2d0a0b22d.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/5722373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dowesitobuga/into_the_storm_movie.pdfIn PDF document text
    • http://puwuvazesako.rf.gd/castellar_font_for_mac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC99 4676 bytes
SHA-256: cc623edf8b052ef950a71790a5f32013e6f8b38f7027add44875586ddd894172
font_01_sfnt_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 10764 bytes
SHA-256: f9566ba4a1f9b664d41b8ac00a6d6ed438588681a0cf3919e99d6d921cb4f42c
font_02_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.