Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd452e093e3fd4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 11:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a253eaf5909be3f3ee12c9808c76036 SHA-1: 0e8dd4d1f51bb44f6b132c874913fe20a959b297 SHA-256: 8bbd452e093e3fd46bf56a25e1a2c1535b6d31ce3aae66592319e184fe43d9d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates that the PDF is designed to host numerous links, likely for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=food+chain+ideas+for+3rd+grade PDF link annotation
    • https://jijoforupet.weebly.com/uploads/1/3/4/8/134864875/kakosuwetovimemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_5feb3d174e8e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff0bb2708102.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/6651485.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/MThg8rf/srs_light_reset_honda_civic.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/4599059.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/jezilosofotu.pdfIn PDF document text
    • https://rokopopowatapo.weebly.com/uploads/1/3/0/9/130969888/xujafugalunidikedeze.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/dWiithf/red_velvet_cake_recipe_in_malayalam_language.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/gajakelegeza/araki_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/zanikupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52823a68-72d4-42a3-a70d-825ab5e8f65f/binojuwudelogosit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9024bcd-c3a9-4726-a9b2-e5380f5acd2a/dmso_natures_healer_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1703c0b1-c65e-436a-a806-98cce9d6cc70/ruvawunivosowilalo.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_beac46268beb4534806856d210edf494.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/bede_and_caedmon_s_hymn.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_6495bcf0075a48239b5e78656d59a97a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c09304-21f7-4e48-a181-9cff34d0d93e/gupor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3c0aac-3939-4d0e-b0dd-2172ee8efc19/el_principito_pelicula_1974.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5368 bytes
SHA-256: 725db08d977f513dfa262e6f77dd65637e52519015e17f4afbd198c15bb13845
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10912 bytes
SHA-256: 70c9c4b0eb34d91e9f010e8b041ddd4688286984ff6a544d031de29d6b95dee0