Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55f91fe67d60d9f…

MALICIOUS

PDF

66.5 KB Created: 2021-01-15 04:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 461b5a26c04236cd64b1e71657fc1e89 SHA-1: 328a58195fff1637b3a38155f94fdb9ed928fa61 SHA-256: b55f91fe67d60d9f99e4b97410acb6dfc9f649d91009c373fd3bd25506267878
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and is classified as malicious by ML and ClamAV. The document body, though heavily obfuscated, suggests a lure related to 'cello thunderstruck sheet music'. The presence of multiple disposable hosting links indicates a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=cello+thunderstruck+sheet+music In PDF document text
    • https://site-1174761.mozfiles.com/files/1174761/brimless_hat_meme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5f9d341035c34.pdfIn PDF document text
    • https://site-1173336.mozfiles.com/files/1173336/47788453392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5fdab32e13c5f.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwejujorod/bjfqgj0/narisar.pdfIn PDF document text
    • https://site-1229106.mozfiles.com/files/1229106/84528788398.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/jc5gIAj/idle_planet_miner_spreadsheet.pdfIn PDF document text
    • https://site-1177591.mozfiles.com/files/1177591/dekosiworosij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382197/normal_5ff4c1de352ab.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/68913890631.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/nifanazaxusixurodujawor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fe495da4ce17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 4936 bytes
SHA-256: a3356bd53809e6a0ec037790d26aeb70ca7dac8b07e98908cb5d727361522c62
font_01_sfnt_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 11536 bytes
SHA-256: 64149d51d6cabf4cb484ddf70964eda25ed02e7c2769dc7f39c4d8eec093f22c

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