Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4276aec66ecb11b…

MALICIOUS

PDF

90.4 KB Created: 2021-10-08 01:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b08bb319761e47c573b5d782111aa1e SHA-1: a35974ea56d6c64208e60f8ae114a62df2681477 SHA-256: d4276aec66ecb11b735501740f28d8ce51cad54ea1d36edf2d128e62c52a927f
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it directs users to potentially harmful websites. The presence of urgency lures further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=high+school+test+questions+and+answers PDF link annotation
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/7034558926.pdfIn PDF document text
    • http://gr-chem.com/upload/files/77472370062.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a713603b96---berivoxanasikapa.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xujojerazekiwuwoxul.pdfIn PDF document text
    • http://potya.com/54334238392.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/51824364686.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/26388710348.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/42904350780.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/fexomemabixusawedegajul.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/68302907635.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fosafutusogesu.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wuwawutavenemoretaziv.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25e2cecd3---78608064360.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/dukitogo.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/votivufukitunixozamogosum.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/xekabanawevixemetunopig.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/29810418983.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/tukurepogogiso.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/79661215742.pdfIn PDF document text
    • https://rubfila.in/files/file/29694519607.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/35749062178.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/pisetijebejesujenagi.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/56049473457.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/xixuk.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://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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 18848 bytes
SHA-256: ded1416d748bc1c75bb476f94b819f6a62ed7b5b6c4bf5785b4251226b2abfec
font_02_sfnt_off000142aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 10972 bytes
SHA-256: 5f9b94dc3578a25248811038fd00232f7307909ca8e67d8b5fa0ad83cd35e1d2