Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d5b62d0d47edf0…

MALICIOUS

PDF

76.9 KB Created: 2021-01-08 05:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d38088dcbd688b4b0d5eeccbf2de1f07 SHA-1: d83fe7eac4fe84b63e64a52982a17d631e1dafbc SHA-256: d5d5b62d0d47edf00580362f98193bcf5b94dbd5d29933083d2c3dcc510c3dee
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=electrolux+canister+vacuum+parts+diagram PDF link annotation
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/6825524.pdfIn PDF document text
    • https://belatefa.weebly.com/uploads/1/3/0/7/130775380/furasukanukoviza.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/hPhglbo/intersection_controller_cheats_android.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/XMEgeqC/mukijivodamixarosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f8f2b16bb5e9.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/k8ifYIc/nixelajunuzunebe.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/hgeckmZ/null_vector_easy_definition.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/3603014.pdfIn PDF document text
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/dizinabifolilub.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/tefogubegolobu-xabumiwar-moxisusixezadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f9713440c443.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/xerofisupedijeb_bugusoruvin_notan.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/tanikanaw/2d_artist_names.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5476 bytes
SHA-256: 31a4fc5d7831f1abb53126553c74c0c0b8d8c8c336ce59887b4db06bcc43282c
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 9972 bytes
SHA-256: 448609aea9b80d130b979dd6214a8ac6e5af63fd9cb92d304cee013127590e18

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