Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbff5e5a7eb72c3…

MALICIOUS

PDF

68.1 KB Created: 2021-04-12 02:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e3c4168e7985232c92db294c49e67b6 SHA-1: 37eb53ed0671a7e22976681a2b149c7861aa5eb1 SHA-256: 9dbff5e5a7eb72c3984330d5cfbe2436abb7ce46d9c5e3469ee3e8deea08a41c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially compromised legitimate websites, suggesting a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.dgs-interparts.be/sites/default/files/60165950635.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/dakorudi.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/wefegazeketalewawer.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/42406093886.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/lozege.pdf
    • https://www.jts.org.jo/sites/default/files/webform/1653940235.pdf
    • https://ambrose.edu/sites/default/files/webform/sovurusogizafubeb.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/34869944823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=c%25C3%25B3mo+para+ganar+minecoins+en+minecra
    • https://campusrec.princeton.edu/system/files/webform/7624886728.pdf
    • https://lib.asu.edu/system/files/webform/bidemuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27a.bin
77c017d13d79af8c01314c83e7456b538c88c733b42515559ed47d4044fd6c68
pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 5260 bytes
font_01_sfnt_off0000e407.bin
a0efa432e25f4267bce3a1bbf139429141b506d4f92901b38622b484bb44df37
pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10956 bytes