Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab170abbde53fe12…

MALICIOUS

PDF

95.1 KB Created: 2021-06-22 15:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f79b2203aa149826bec4610afb5f8e SHA-1: 113d8d3aa6d77d77e46aa9c8480f798bd96a192a SHA-256: ab170abbde53fe12c2e4c9df85bce2dc979d3b0773fb72db6f7e72285213df21
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or content distribution network for malicious files. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser update or extension, a common social-engineering technique. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lopuradusat.weebly.com/uploads/1/3/5/2/135297354/vizemopotoz.pdf
    • https://mufikufit.weebly.com/uploads/1/3/4/7/134766202/39e46d95d59041b.pdf
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/a7795a56336110.pdf
    • https://jovuximunises.weebly.com/uploads/1/3/0/8/130814448/kedijivexufa_sudadumozunad.pdf
    • https://tobapedez.weebly.com/uploads/1/3/5/3/135344168/kovedajape.pdf
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/c2ff40ffc130d.pdf
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/8508415.pdf
    • https://dizeremugeb.weebly.com/uploads/1/3/4/2/134235396/6649536.pdf
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/venuno-puxadutefube-dubefi-bozaxosufipilip.pdf
    • https://cdn-cms.f-static.net/uploads/4460263/normal_60c2a55a83872.pdf
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/5724c04329a6a7.pdf
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/8861133.pdf
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5fec7811cdbd7.pdf
    • https://cdn-cms.f-static.net/uploads/4411682/normal_606a7dd3b91cc.pdf
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/katufisudisipeji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/sq/ugae/~3/WVKuihPcy9U/square?utm_term=alexa+escape+room+cheats+garage
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c3bd09acd5f27c4dbc550b/1623440650537/wuwemokibekisowadesojibax.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60cfcfe7a9202f72b0fc9f66/1624231911491/marriage_registration_form_ahmedabad.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c73664c714e269024cba7d/1623668325230/52351961238.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60cd55419c9d3b133208892d/1624069441353/coh_cheat_codes.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60cc9e03278f4a55adbbf58e/1624022532006/pawoxusunimimov.pdf
    • https://static1.squarespace.com/static/60bf6c6a79613f649bb1d090/t/60cdcf1c23997448e1dc6ccd/1624100636218/princeton_review_cracking_the_sat.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c46a6a73577e58025fce2e/1623485035556/xopivabexatomewuluwifij.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c9692942d4863cd91f5250/1623812393935/boxodifixorolojajavo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60c48bb5b49a1c21bd296718/1623493558909/72005011084.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012215.bin
113f1534e1f01d4e2bb02803af9d16436a12387a24d05444809d13e0d3dc1a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12215 6440 bytes
font_01_sfnt_off0001320b.bin
f24dc2150d5cb4036bbc387e69802f39326633f8851e6f74584cb9916d2e0b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 5404 bytes
font_02_sfnt_off00014447.bin
f5fee3e416bf78c0ddf239aff38fb7f7a369964ed2cebf485ced35ebbc2ca0f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14447 12468 bytes