Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b9ac5f3087d8a0…

MALICIOUS

PDF

70.2 KB Created: 2020-12-18 11:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1d1103462dc44d039334c91020ce8a72 SHA-1: 31249101e63450513361985fed5d2d0a545e37dc SHA-256: 28b9ac5f3087d8a0dd8dca83ed7396970b1af799de87f3d7dba9ad0f1c9d542c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ggtraff.ru/123?utm_term=blue+buffalo+basics+salmon'. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links on disposable hosting suggests a phishing or scam attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=blue+buffalo+basics+salmon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_5fb6dcb3762bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fc8fb06d85b2.pdfIn PDF document text
    • https://wewejemaviga.weebly.com/uploads/1/3/4/2/134235466/2009042.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/watatogamep.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/gizotexubefud.pdfIn PDF document text
    • https://nikevafojo.weebly.com/uploads/1/3/4/6/134680040/d46ee05487f2f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fab7944b499e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5fd73761b4eb2.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/tetofamuxulil/alegreya_font_free_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabf920c-932c-45d7-9c82-e1961cb31ff8/mekanism_ore_processing_x6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1ed74f-1294-4e9d-99ac-a3c4aae9e4ad/pirem.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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 5120 bytes
SHA-256: 85c8f57d8c9e5ac439af019f2ac01843b2973ebec2423dafdcd5957d7e88a843
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 11068 bytes
SHA-256: bda55110b961a4d2b6b8311b944a29dac7a15b510722adf2ae25dac0ce9cc493

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