Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e18c997d9f63dbd…

MALICIOUS

PDF

86.5 KB Created: 2021-05-18 13:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 108a7320df5fb27dce611d6aef567414 SHA-1: 6acd909abcb4cd658cf084b34152bacedebf4577 SHA-256: 9e18c997d9f63dbdca9c9ef2cf5e6f1feaf06d8055c3520fd5d05dc3c4c53df5
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. One of the embedded URLs, https://dafemum.ru/strik?utm_term=piano+notes+chart+61+keys, is identified as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, likely intended to lead users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/strik?utm_term=piano+notes+chart+61+keys In PDF document text
    • https://rufawakifored.weebly.com/uploads/1/3/1/8/131856207/5c2931b28.pdfIn PDF document text
    • https://fusorebumobem.weebly.com/uploads/1/3/3/9/133986296/kugejugabulefuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ff85c9345f0f.pdfIn PDF document text
    • https://tisemijosugimuv.weebly.com/uploads/1/3/1/0/131070246/a33848a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6043b1e442706.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/7584007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_606867d8ea03c.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/sokunijopi_sagoxiwal_ruvar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5feb427fbdac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_606df8c3aaa5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_606566af384fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_601c75230a515.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/36767b7e-ae6c-4f5d-ac78-2933bf58866d/what_hawaiian_moon_phase_is_it_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb80b6a-d580-400c-910b-321b6ddf3474/que_es_la_contabilidad_financiera.pdfIn PDF document text
    • http://majuzudotalu.epizy.com/b_boy_blues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e89991-a37c-4318-83aa-b91fbedc5367/driver_canon_mp470_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b187b51-f487-414d-aa18-165da3688f41/noxerimaluma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea3d5f5-9a3f-488d-a2bf-a2e86a44c6df/dazubapixadikesoboxa.pdfIn PDF document text
    • http://vituzitozitu.epizy.com/37648323502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ab021e-f032-4ef5-961b-fb02e39da3e7/malik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492a2412-a9c4-425a-a521-6fdce8e30fe0/the_secret_scripture_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90de473d-5e11-4a74-a5af-c56049a221a4/selaloxawux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61322235-670a-49eb-814b-1643f8ce2930/agatha_christie_poirot_tv_series_cast.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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 5228 bytes
SHA-256: 52dc87ed501e2712d08959ae2fbc0c7bfa39048d15d6c0a7045e5317d0fba0cf
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 11736 bytes
SHA-256: 2afdaf67e7a6a25b3600dcf5a0c45aad830964cc89f2e9d1ceaa7a4fa7da67ef
font_02_sfnt_off000136d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D0 16124 bytes
SHA-256: ca8924332c682f6aa269259043c77ed8c2ddf1c4bf9142698657eaefc958103b