Malicious PDF — malware analysis report

Static analysis result for SHA-256 d220b773d4b107a9…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 18:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e0045713aac0fc8252d4933c3fc14ab SHA-1: 9fff3e32c63714740de8d476da354359f354f09e SHA-256: d220b773d4b107a9b6b5a5b21e8a9de9f71afa807bb9c90408c4322127aedcb6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/strik?utm_term=unit+operations+of+chemical+engineering+7th+edition+chegg PDF link annotation
    • http://zejirejajedudu.getenjoyment.net/anexo_4_oaci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_60411ca011c35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_604f2d2d2bbdc.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/tekepepupa-rorufowetuxed-pamix.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/8da1b2c2c.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/child_care_interview_question_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fff750bbf17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_600e4d69bc423.pdfIn PDF document text
    • https://xadinizojagum.weebly.com/uploads/1/3/4/0/134016813/1439760.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/96864074334.pdfIn PDF document text
    • https://bagetakibejo.weebly.com/uploads/1/3/1/8/131871627/320e022e6ff54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_d563965685e7455fa8ad78e73ae54e55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/nagasuminugubugutenetu.pdfIn PDF document text
    • http://niwepikos.rf.gd/how_to_translate_arabic_file_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/xasidemi.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/28860951360.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_6ee87b9e490e4aef87813ad2420b5f09.pdf?index=trueIn PDF document text
    • http://maxafatuvapare.rf.gd/rumiwusutovenol.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 5640 bytes
SHA-256: c9948f322300295b32e86639815df1836f8c3761e146836a9377aab21fb32e7b
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10636 bytes
SHA-256: 01f5e3d103a78b79de3bee6cea066235444fc051c5dc059d4b270d7685381cd6

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