Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8b0f3e3a0965f7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7647e634d2504c7971d5414fc5adde2e SHA-1: 45bdba69e15894d32c00278fbde528d1f5ba2522 SHA-256: ae8b0f3e3a0965f7385a453cfc481e47ef93fc27728c3f787ff95b0f75b71e04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4071e7e59b8f8356626149aedf07f153/segapunekonudorem.pdf In PDF document text
    • http://igabana.com/upfolder/e/files/20210909030001.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/fururiposabixu.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/39115305047.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/kevovabo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xutomilekikugewilavawi.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/59438483422.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14560e868---zolujutogodafo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/3618124774.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dijijitep.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/41663677153.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/19519503224.pdfIn PDF document text
    • http://belean.pl/userfiles/file/71287352138.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/keguriwila.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/31576467848.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/joviveritumazed.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/55142741310.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/98878304432.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/koxibuluju.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/gunuzofujivubegama.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/durekosozulogikozokujex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hill+climb+download+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 10456 bytes
SHA-256: b761e07303a12537f2a2b446d60f9ee077f8cd67c88f8b4c1b5b8ade965db958
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 17580 bytes
SHA-256: 74e22b526c94eb1eb34b9226379e372b73c0c2867ebf1bdbab451a97a885eeac

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