Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e73b503c2b3f5e5…

MALICIOUS

PDF

70.0 KB Created: 2021-04-07 10:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbea3fd97e7effd0c7994708c47ea203 SHA-1: 6e77d5f0798c3a550dd189cb5d1dab4b3195a1cc SHA-256: 1e73b503c2b3f5e5e3408ea3f2d067393386c1e2a41e471e231e4590fa3acc4b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

Heuristics 4

  • 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
  • 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 http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/bemefunojupupik.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • http://www.friendlycc.com/sites/default/files/webform/98819861428.pdf
    • https://www.afscme65.org/system/files/webform/rerezuduzolorefa.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/memirudomonejusowanasu.pdf
    • https://www.jsif.org/sites/default/files/webform/nozixedexifanozavarojiro.pdf
    • https://www.uts.cw/sites/default/files/webform/tizodakemepegipupimegoxi.pdf
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dofivefodazewinewes.pdf
    • https://www.dgs-interparts.be/sites/default/files/41094691834.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/45910982832.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/93322629498.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/81254010544.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/38059385999.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=small+is+beautiful+pdf+francais
    • https://campusrec.princeton.edu/system/files/webform/jelozubunumi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b6.bin
13715af5c5b55f92752568b2c8de9575b0124d018b0a583df459af3fa81c567a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 5544 bytes
font_01_sfnt_off0000f46b.bin
5ac1ef4579b16d54ecc27965a211b2c5908310aa7787f2a2f2142cbcc91689a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 12896 bytes