Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d7d9879fcbccff…

MALICIOUS

PDF

71.9 KB Created: 2021-06-04 16:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 34d05c415798589c1c5f93fd6ac7099e SHA-1: 4b547c96946f7de89ff265471ade18d67b9d1e84 SHA-256: 27d7d9879fcbccff655cf6d76757996fc96516f8ce7d1bae2d339b59290a6ce9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through the linked content. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of its specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/pbw?utm_term=fnaf+baby%2527s+nightmare+circus+free+online+game PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449973/normal_5ff8fddf79719.pdfIn PDF document text
    • https://fewirikikekaja.weebly.com/uploads/1/3/2/3/132302896/penavumup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd18f409c375.pdfIn PDF document text
    • https://minawitagolufu.weebly.com/uploads/1/3/5/3/135312922/2036401.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4499633/normal_60b2a84e96c5f.pdfIn PDF document text
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/1d6d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144428733/wujebep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900e4475-4381-4004-baa5-bdf08182c44b/favezafixokepojuxufukirew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97564787-f59c-40af-bcfc-84e162413479/suzexebesipakeb.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/51294635211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f5d0de-bf51-4ff0-8927-4192a5219cbb/7694003569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ffadd3a-57bf-40cf-b71d-dc245d972073/what_is_guidewire_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b760c23a-60ad-4d62-b997-cacc4ff0618b/74607133410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21248d4f-7238-440e-bdbe-26e442231b67/potubewazosopusokidap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaf0077-fafc-45ef-8774-c07732c75b45/nirajerajumek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a00a187-d3cd-4f13-af0f-8f2878a9127f/english_learning_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6b1c8a-4a0e-4e39-9aa9-8892a57e7286/winivufidibu.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505989/41580347975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa66ac9-aa97-440d-8284-677e757289c7/niveles_de_prevencion_de_salud_primario_secundario_y_terciario.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144548256/why_doesnt_call_of_duty_mobile_work_on_chromebook.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411849/20_laboratory_apparatus_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1527b34a-a88c-497d-93ff-b68b19809dbe/luninije.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5528 bytes
SHA-256: ee4799b85d6b9d8baf3c8a35f9493d1104f9d9b6d6502345fbcefc0faad00b95
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 11068 bytes
SHA-256: 6743dee609a0464cf8682091c5195bf7b0ce9d5c84155d1a80e2a093c1262dd3