Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e9c24f621145f…

MALICIOUS

PDF

89.1 KB Created: 2021-05-01 15:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da42d6612e2872403d8ac1096874cfba SHA-1: 66e74c821239dd92b827fbe0887583ba0f5a1aa3 SHA-256: 774e9c24f621145feabece293a325272c4e4009796c1e2d9fce47505da7841dc
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF structure strongly suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://soxebez.ru/strik?utm_term=focusrite+control+no+hardware+connected+reddit PDF link annotation
    • http://befigter.xyz/xedozomaxepodacymhc.pdfIn PDF document text
    • http://prostochillforum.fun/17454136180ff9wm.pdfIn PDF document text
    • http://varnisvakq.ru/immunobiology_janeway_9th_editionic1gb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_edf3b4ba9e7e45a6b609e95adadee505.pdf?index=trueIn PDF document text
    • http://gofozumi.epizy.com/car_games_for_kids_boys.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_e8ed2a75610d480d845a23fb43116ca8.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_330bc9b1e8bc4219ac23455a553cc7a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d7fa77-b2e1-4964-a416-be7578f0fa8a/what_is_the_american_disabilities_act_and_idea.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_a8050ae09f2347cfb6c8a3d2ac478940.pdf?index=trueIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_0ea78a05c6134ead9c107a546ecc1c20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be811a7f-41c9-4c2f-b393-18f451bd3194/40484382745.pdfIn PDF document text
    • http://kugovede.epizy.com/90243305726.pdfIn PDF document text
    • http://xizoxenefodage.epizy.com/aggiornare_android_su_samsung_s3_neo.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_08f29026e92448e4950a7325d2c26587.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_a62e2a12fd2747d0a74678484b57cab6.pdf?index=trueIn PDF document text
    • http://sefogozi.epizy.com/protein_bar_nutrition_information.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_c4e8e84297564108a885b6f9df59f60b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ff07a8-63cb-407b-8fd0-49c76be6efda/55653883022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af39335-cd51-4378-9c02-ec19a2fd1632/jimivavabakiriremotopuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065ad30d-ad24-4b84-aa2c-be541feb5882/al_ruqyah_al_shariah_mishary_rashid_alafasy_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f032e4-60c5-4905-ba98-7dd977531640/how_to_soft_reset_a_samsung_galaxy_s6.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_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 5076 bytes
SHA-256: 1e07c8352c32066f4ee1bbb09598cf3d0ad3aade5c85339c38a8092a4a80e3d6
font_01_sfnt_off00012e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 12076 bytes
SHA-256: 97035960021e6f84be68bb0f38776b7bc4bcb356985d757153fbb046834851f7