Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c1f04a302f0db…

MALICIOUS

PDF

79.0 KB Created: 2021-02-17 15:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c674a00cd2e052ee91aaeaf15da36d05 SHA-1: 72da241c66283bdc39ab47b6e8be04b9f05f1506 SHA-256: bc9c1f04a302f0dbb5c44f6939173a6e939023700950abdbc3a0817f3765cf01
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness.

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=andrew+zangwill+modern+electrodynamics+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4505358/normal_5ff3c18b4e839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fd034ce489e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482870/normal_6022effe7cfe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fdc4166c0497.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/wirav-kutazakidi-ralukerij-pezegex.pdfIn PDF document text
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/xavuzisamivenolizad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fe8bb3438d8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5ff25724264e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f557108fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_600676c22087f.pdfIn PDF document text
    • http://nicepics.xyz/revab7cowq.pdfIn PDF document text
    • https://wegoboxup.weebly.com/uploads/1/3/4/7/134772399/nefomi.pdfIn PDF document text
    • http://optamorem.com/gopedi56zdt.pdfIn PDF document text
    • http://promoocaoameericanas.com/m2_browning_fallout_763hj23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_600e1a5606f2e.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/b8840f05c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_601d37b21b1d8.pdfIn PDF document text
    • http://50offstore.info/clumsy_synonym_informallstav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixatax/42536553969.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/lavibobejesa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 5708 bytes
SHA-256: faa39f8081486c1796c8c0b6836ac1d5d5426c2be2a3995f431fabdddbcb172d
font_01_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 11400 bytes
SHA-256: b7b01a380c0a7ccb4a6b443ed3ad3ab71ff9b5b1e1cdcd5cc6e855809c9dd262

Open this report in the interactive analyzer, or submit your own file for analysis.