Malicious PDF — malware analysis report

Static analysis result for SHA-256 7906ee480a1c2328…

MALICIOUS

PDF

77.4 KB Created: 2021-05-26 04:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bb49c50e6869b3be217bdd393dd7fcfa SHA-1: a221965ef1a201e7f242fd3bb52c58b02466ac9e SHA-256: 7906ee480a1c2328407196d026004f18fdb703d9196abc54fc15a2b9f1e680f7
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, presenting a deceptive lure related to voice conversion to encourage clicks on numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or phishing. No scripts were extracted, but the embedded URLs and PDF structure suggest a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=change+active+voice+to+passive+voice+converter+online PDF link annotation
    • https://vasigigu.weebly.com/uploads/1/3/4/6/134607878/2600724.pdfIn PDF document text
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/pujipowomojapu-refatapim-pazurarug-movakinuludimi.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/litupezitubemebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375702/normal_5ff75735c3768.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/e7d77cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_60288f008a843.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/loxawore.pdfIn PDF document text
    • https://midizovusataleb.weebly.com/uploads/1/3/4/6/134618082/5288560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_604ee64412a3d.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/2eb0964e81a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_6068794f25bba.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/6067049.pdfIn PDF document text
    • https://givigifug.weebly.com/uploads/1/3/4/8/134858651/gukeduwud_burogebulavu_jiwuw_tosifesexif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_605106ba7fcda.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/45c1ddb755e3a0.pdfIn PDF document text
    • https://joxukitemubat.weebly.com/uploads/1/3/5/9/135957717/580348.pdfIn PDF document text
    • https://gapuromediwav.weebly.com/uploads/1/3/0/8/130814643/6684347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_602b3ad7cb788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451954/normal_6005c0d4ba3bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5fced7909a898.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/galinikagopit/whats_in_a_blue_ocean_water_from_sonic.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/printable_color_by_number_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/54080317896.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5160 bytes
SHA-256: c8075f5de666d900c68cc2543306b36e9fd6197e070103756d621b3e7acf5904
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 10844 bytes
SHA-256: 7865dd9d5bc7b6549c4562cad00bf564150d31fc582173c52f6a71ac2377b210