Malicious PDF — malware analysis report

Static analysis result for SHA-256 851e8888a73e8f60…

MALICIOUS

PDF

81.4 KB Created: 2020-11-19 11:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6a972b01f0b586ef45f2a49962d7580c SHA-1: d27c51e11ecca359fd3d78df029a725b2f800c8a SHA-256: 851e8888a73e8f608a8c909ae28900a9cc8e081c12795ce23c0c3b9f7f53d2e9
184 Risk Score

Malware Insights

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

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 0.9998

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 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/strik?utm_term=izlesene+video+mp3+d%25C3%25B6n%25C3%25BC%25C5%259Ft%25C3%25BCr%25C3%25BCc%25C3%25BC In PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdfIn PDF document text
    • https://wubawujol.weebly.com/uploads/1/3/4/2/134266052/be4d348b40.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/fekojoxu_pavexifikaweke_laxakupid.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/6028b1.pdfIn PDF document text
    • https://lavazelowima.weebly.com/uploads/1/3/4/3/134316744/faa43b5.pdfIn PDF document text
    • https://lafapimiwegu.weebly.com/uploads/1/3/4/0/134041150/jitegojevexowu-katawik-nuzeto.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/fanamezijajisu.pdfIn PDF document text
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/6427fa6f8926c8.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/nuzaw_misogipi_wolobaxadajerun.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/jazofi/moromedefalalazoxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f301caa1-adf4-4fc0-b16f-8ae196e58a90/29844614557.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/zach_mindy_married_at_first_sight.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/nova_near_orbit_alliance_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b4f528-4f82-4f81-80f1-eb12b8654329/19065595717.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/80671160895.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/72355332242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52c0aed-b9f0-4124-887d-188400ef220d/dalosanurarumusuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145d54b4-a1ef-4a03-aa6a-877c768ad9d7/41061523637.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
    • https://www.ll.youtube.com/watch?v?IWA2pjMjpBsAbIn 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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 5724 bytes
SHA-256: 370cdba6b712e96ba1d22e1749eab29196571a049f02d727d9b897837ac34dad
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 15248 bytes
SHA-256: 9b6e0e880079acafe675c09b7869fb7391306850db3d237b6469deb203704d8b
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 16208 bytes
SHA-256: e50835c8fa39a03c5c4f922ffe3ebd794e8b26cdf9c7bbbae22833c292fdf1d3