Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c328f4bdaca67e5…

MALICIOUS

PDF

75.3 KB Created: 2020-11-20 05:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: adce068ff22987c5612f44778d1919bf SHA-1: d68141ff3100ac9fe000d37846c67db3ee099dce SHA-256: 9c328f4bdaca67e572f662be06718591f0d37263fb33ddf53b3326581b0e6b3a
252 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://cctraff.ru/strik?utm_term=bully+pc+download+highly+compressed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5f9491e491053.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/3978156.pdfIn PDF document text
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/7759374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5faf32d43520c.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/kefavapa.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/filala-fujepo.pdfIn PDF document text
    • https://newajijamo.weebly.com/uploads/1/3/4/7/134750143/4415401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a866a0-6d94-4a3a-8fdb-7f9aa2bf79a6/varinuwexutosavowuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23de864e-2aa4-471a-a56b-6b1a066bcc7d/hayley_smith_american_dad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1369555-e616-4169-90ec-aa0fa86247e3/sominobelimapu.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/98300711045.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/modekaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265f00d4-bc8f-457f-bc11-858fe6b6161e/92965921353.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
    • 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_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 5732 bytes
SHA-256: dd7f0f3d43f451b964048725a7dee84683718a6d5ac37ee50868b09129c1dd0a
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10692 bytes
SHA-256: f00bf596ab256ee5f5266ce72afed029446ac6363c39020edf9f9a2ef59d33d3
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16136 bytes
SHA-256: ddf4a9a39075b4a3c403586341f007ae0c2371fb3231726dd498580778e63d5f