Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e36e228d3df6f8…

MALICIOUS

PDF

58.5 KB Created: 2020-12-01 17:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a5f8984a0c45ffe0dc06a5cad3073201 SHA-1: 16f149a256c671dfb2f166080c509154fdc1dfa6 SHA-256: e9e36e228d3df6f835e120e24ac148c883bb3814f7d61855bd93be289516ef86
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'ggtraff.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings that appear to be part of a lure, referencing a 'reading guide ap biology'. No scripts were extracted, but the presence of malicious links is sufficient to classify this as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=chapter+10+reading+guide+ap+biology In PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/5562614.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/pezar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f8fb6c18aad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f9ab2b6bb465.pdfIn PDF document text
    • https://sawifotu.weebly.com/uploads/1/3/4/5/134597463/00d18c3495e.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/449769.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/fokapikow/ragog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37309f6-1374-40fe-af6a-56ac625a266e/38564515879.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc0dfe25147b1480453f5ef/1606475746421/solve_ode_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/52445491422.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/lanzamiento_de_martillo_para_dibujar.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_off0000a9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AC 5384 bytes
SHA-256: 3bd27ad4283afe55b927cb4085bd5f6dc21c23cfbb14ed9b3f3a66e1951f5e61
font_01_sfnt_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 9816 bytes
SHA-256: ea50bacf3defd4a65ad3da5ab398f5ae7bb2332ced1089145b25231fd37225fe

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