Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aa64f85fa9e952…

MALICIOUS

PDF

64.3 KB Created: 2021-04-11 07:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c982d6212a84f50cb2a95bece1f5f4dd SHA-1: 57e1e089719e78594c5bde946b70bca731468b7d SHA-256: 26aa64f85fa9e95297238f91bb2eb0985e6669beaad8b9048c5772b74d35ac4f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure for MP3 downloads. The presence of numerous embedded URLs, many pointing to seemingly benign academic or government sites but some to unknown domains, suggests an attempt to obscure the true destination or host a phishing page. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://ambrose.edu/sites/default/files/webform/fabifuturofutip.pdf In PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/nojezajewi.pdfIn PDF document text
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/zajufofagobixipisuna.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/604022749.pdfIn PDF document text
    • https://vectorcorp.net/sites/default/files/webform/resume/86038084563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=celaleddin+ada+dilim+tutulur+mp3+indPDF link annotation
    • https://drones.princeton.edu/system/files/webform/xakunowegetudirojevogejiw.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/febapaxugodikuzakepob.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/21250884575.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/zuwamusijugowop.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/56905881998.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_off0000bfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 4996 bytes
SHA-256: b81746cf1282170bd35969c00ebf1334883c6ae9a16c95ded1e14a95abcc23b4
font_01_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 10984 bytes
SHA-256: 276b6ddc1543aee94baa0425015df642a45f99712e3cde6f1a498d6bf91147a8

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