Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7a09f65778dd32…

MALICIOUS

PDF

86.9 KB Created: 2021-04-10 00:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2259cebc778491f3b3e98972ab6db44a SHA-1: 8694c366fcd389bb92b8d4ec4c004e32e8699a62 SHA-256: ab7a09f65778dd32bc2320dc1960906bb65037da69d237ce5d86de2c95a2758f
134 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs and heuristics indicating it is a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Gladiator vst download free', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vectorcorp.net/sites/default/files/webform/resume/dufovomajaxavekasodulep.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sowasipaxezok.pdf
    • https://ambrose.edu/sites/default/files/webform/padubomi.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/ziseriwutekezarog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gladiator+vst+download+free
    • https://printandmail.princeton.edu/system/files/webform/83605599331.pdf
    • https://community.princeton.edu/system/files/webform/xakefabobadu.pdf
    • https://community.princeton.edu/system/files/webform/setokan.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/66140853426.pdf
    • https://printandmail.princeton.edu/system/files/webform/60959229638.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/43157208480.pdf
    • https://lib.asu.edu/system/files/webform/90369837207.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19f.bin
9cd8641785538a8769d7ca18fa19904967a1a65e8492a5b2950757cd2eef5abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 15688 bytes
font_01_sfnt_off00011436.bin
938b147e3646d61727d04845f30a7d893b0ab508782f987c03050c73774b4468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 5084 bytes
font_02_sfnt_off000125a9.bin
3ca82346ccc37f4ec796d437905d9573210ff155b22782404a7d3bfe616183e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 12084 bytes

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