Malicious PDF — malware analysis report

Static analysis result for SHA-256 8847d10cd901f8ac…

MALICIOUS

PDF

125.4 KB Created: 2021-03-25 16:28:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 72d7c6d02f52f2c5a3a429918b10b2b7 SHA-1: 69312ec99cec8aaf3ae032e61ffe74cfa1ebb524 SHA-256: 8847d10cd901f8acdca9468636d2efc05f28e835cb39d15b1d12e609d401a340
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to search results, directing users to external sites. The presence of numerous links and disposable hosting indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://golowaki.ru/award?keyword=acetic+acid+properties+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6018e76a3f988.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/JHb1Pic/baxotasezadiwuv.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/azzara_band_alala_sayang.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6025cf23d83f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420235/normal_600759e10fe28.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/3gcaYja/51464541356.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/lovetijif/odisha_outline_map.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/celtuce_nutrition_information.pdfIn PDF document text
    • http://juroluse.rf.gd/depobubozibodidanesaxubu.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_83868d2487cd4ce2877770eaf6112368.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_f539b79be2274be4bc2a0c8246cbeae0.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_ff4e6f4f90634876ba9d9cd398aa8168.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fbff92-998d-453d-9d00-f84d34653a7e/resumen_libro_el_guardian_entre_el_centeno.pdfIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_0d702120ffef414fb3784ee1bace2d4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/java_tutorial_for_selenium_testers.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/curtis_sno-pro_3000_snow_plow_parts.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/swan_neck_deformity_vs_boutonnieres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a7ffc7-7995-47db-b2fd-f9cf1395aaa3/one_of_us_is_lying.pdfIn PDF document text
    • http://wosakev.epizy.com/gomujobunebo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001829f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829F 6492 bytes
SHA-256: cf6bcbaf462759e04676f8989e7e87ed4d43c4317550ddbd0c5684ab0bd17b73
font_01_sfnt_off000192d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192D3 5104 bytes
SHA-256: 5cf3c6ccea14af23c8954090b32511e338f478a13d2e21af7e82f676a9cf2a5a
font_02_sfnt_off0001a447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A447 14144 bytes
SHA-256: 53db5c1f0bca8ff61d6517cca4eb1e9cfb1498c05c74f43b864896ab3cee907a
font_03_sfnt_off0001d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D252 16128 bytes
SHA-256: a492b4f59d97a8153a546570828a62261a626e14021681de7113f490fd942130