Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0955c2cb53aae2…

MALICIOUS

PDF

80.1 KB Created: 2020-11-25 11:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2b21366a27df183248a2f93f932a4e47 SHA-1: 90c8611e827d0d9dc7ac5b231a0d8877092aa36a SHA-256: 5c0955c2cb53aae23f2e9c04e2c7093d43266e97c8291b28d580c8b5e3ad8b18
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/aws?utm_term=kdigo+guidelines+ckd+summary In PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/6a020.pdfIn PDF document text
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/selefej.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/258829e9c7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f875958daf85.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/61a83787381c.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/944084.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/1d82739f20a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f93decdb731e.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/bfedbb32.pdfIn PDF document text
    • https://xokapajutubesa.weebly.com/uploads/1/3/4/7/134730315/6f6b222d1ce2e.pdfIn PDF document text
    • https://melubezu.weebly.com/uploads/1/3/4/3/134311229/buxipifamupigikuf.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/98329e4527b81d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e185a91-daf2-473d-8957-aa8b186826cf/fejukopa.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 3592 bytes
SHA-256: dcb3023c9428ab53c9a788622a9a1b760cc3a5f41eef2e87720e1d56cddd76a1
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 5396 bytes
SHA-256: a5b3bcb9e0baa05c87c54c8f9338efda2b8f5dbd876b138a1f2f53de2aa27cac
font_02_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 2232 bytes
SHA-256: e003d381706bd4acd63125d220e4f97b7c03a7de02500cab00c1e583f7b973b3
font_03_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 5036 bytes
SHA-256: 145a9cf8b415971dae9661b9a697625a3a6e4b0ee2b2e3cbef74af597e991c23
font_04_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 11992 bytes
SHA-256: bcbe2a95a157c0b504850582fa1b7a2fa7815963e3533bdf0cf71ab7547026a9
font_05_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 2592 bytes
SHA-256: 790fd26b006d3fc2a0a9cbd351d36de43653df8bf85cc8ead3b8859211ab661b