Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0208b5559073f8…

MALICIOUS

PDF

71.1 KB Created: 2021-04-16 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31aa5d4d3c012387511ff9c06a660d82 SHA-1: 28c5b0c49cb17b8988acee64725028eff5dfe4ca SHA-256: 1e0208b5559073f8fd5c3e4d9071a28d597051e687974e9bf2203e91dbebe4f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.natsihwa.org.au/sites/default/files/webform/25680057182.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dofivefodazewinewes.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/238550972.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/wibojamivumararevede.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdf
    • http://spotlight-sites.com/sites/default/files/webform/4279473489.pdf
    • http://seiary.com/sites/default/files/webform/rec/netugapufuzutazegiwiwivi.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/gegemapoxazokex.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/26688185713.pdf
    • https://ambrose.edu/sites/default/files/webform/9979090083.pdf
    • https://architecturaldesigninc.com/sites/default/files/vudezuluxi.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/tixatikuwasa.pdf
    • https://www.dgs-interparts.be/sites/default/files/55949953827.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=online+data+science+degree+reddit
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/72323592377.pdf
    • https://community.princeton.edu/system/files/webform/26098210740.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04a.bin
469caee8d7ffef2edd7c90e7290961641e4ad1da6bd8fccd9ce1c72602f1b40d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5132 bytes
font_01_sfnt_off0000f1c7.bin
415b3880d29b36bc42c1cdaa441095a31932b1c4e2c4ce7c9de9f707062ec763
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10568 bytes