Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28ecc8858f247ef…

MALICIOUS

PDF

72.0 KB Created: 2021-04-23 09:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5aa297161800f0232a164badaa0bc99d SHA-1: 528d767b954243ec364c472618d61e2491660d64 SHA-256: c28ecc8858f247ef7eee2def0aa007203d9cdf41ec9cefe05d792d727a3d49fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body contains a seemingly innocuous question about connecting a printer to WiFi, which is likely a lure to disguise the malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to obscure the final malicious destination.

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.uts.cw/sites/default/files/webform/vogoledifekotukedadawen.pdf In PDF document text
    • https://www.mothercare.ro/sites/default/files/webform/resumes/tizagoge.pdfIn PDF document text
    • https://web.liderpapel.com/sites/default/files/webform/21411595718.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/powevalixerofewum.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdfIn PDF document text
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sixativitav.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/nuxikovevevugodir.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/tasuwagorefovufozibojer.pdfIn PDF document text
    • https://www.termis.org/system/files/webform/776381217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+connect+my+hp+laserjet+p2055dn+to+wifiPDF link annotation
    • https://community.princeton.edu/system/files/webform/wijudabopijobomoxusosul.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/67925993666.pdfIn PDF document text
    • https://community.princeton.edu/system/files/webform/tujuxegagisezemesolut.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 5812 bytes
SHA-256: 9d7f98642d721a8dde073095a3f3b2ad0f04c375d9bac5995f3644c321ce1aeb
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 10808 bytes
SHA-256: 563c41af56e7c780d3733aa7214b89e59dc503e6123cfde120b863915edd5f4a
font_02_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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