Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e8351bb6d299db…

MALICIOUS

PDF

76.8 KB Created: 2021-05-15 04:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc8889a318c1accdeaa04c27fbfa67ec SHA-1: 21b6c89a2732aa5f04e3ee45f38589923a5901d3 SHA-256: 59e8351bb6d299dba134c3b4cb24550219c9c2bfd31b1a2507164d22f7d3d8b8
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to a network of linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=taco+salad+bowl+el+pollo+loco PDF link annotation
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/6121174.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ff714d026a8f.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/8493453.pdfIn PDF document text
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/budewi.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/jeRqDCs/pekozipupudaxowugaki.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/6hjUjg6/daxikivos.pdfIn PDF document text
    • https://kukutapiroboj.weebly.com/uploads/1/3/4/7/134712573/miwod-rezijajogesila-pukuvubirebut-gizeduwifimobo.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/hg5fWeu/bubble_pong_master_of_local_multiplayer_ball_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422627/normal_6036cfbe0c643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd27dcd95fe3.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/6a8616.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/zibizofofukem_fiwanufitazi.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/ihiggcK/sovuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5ff968bff07d0.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/5zJgijd/gekiwamagox.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/melokalegokuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_94861bbae44d4a1b969abc3ce7896fad.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_1de338c8815e4f6caf206d8df9d5e4cf.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_34d8dfc8b0bf4013a5174505160a3de1.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_f230cdd4d0e1456899f9a0e0c43d6cc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/charlie_full_movie_free_tamilrockers_400mb.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/3d_max_design_tutorials.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/quran_arabic_online.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_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 5152 bytes
SHA-256: e9240a5d330ee1ccd56cd4749c11a3bbff6d7fc466dbe0b7b7a818f5f39d9010
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 11240 bytes
SHA-256: e9b97145c2b27712696a02232238d5f17ea82f4db36c27fe4896c2d562af5f6e