Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b34270ddb654056…

MALICIOUS

PDF

155.4 KB Created: 2021-05-17 21:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c4f7da5431f6446f43b14e88ca7058d2 SHA-1: 50bab7f6c299efb4db059c0a389166b337688cd8 SHA-256: 4b34270ddb6540563eb55bc94ea3f6e49509d0126598e19cdd4354e9c57c86d5
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 ClamAV and 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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=best+number+theory+books+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477629/normal_606e65854d969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_600fa00030b27.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/pesewelufose-nojatuju-wofurob-xozinuge.pdfIn PDF document text
    • http://gefituku.iblogger.org/92904303676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_6002b2f0d02af.pdfIn PDF document text
    • https://nikizatul.weebly.com/uploads/1/3/5/3/135309179/b29a1d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_602cac182a227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd26001db661.pdfIn PDF document text
    • http://jusibebobekig.iblogger.org/nisodedet.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/busutafitufe/padi_rescue_diver_knowledge_review_answers_chapter_2.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_7848ad77b8fc4173bab5d88bb635aeeb.pdf?index=trueIn PDF document text
    • http://nodefojabotozij.rf.gd/wefusi.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_d5496000b223408c9678743e99baaf60.pdf?index=trueIn PDF document text
    • http://joxisuzu.rf.gd/caste_list_in_bihar.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/wumijurebomepekupijam.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/49227663587.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/one_column_cash_book.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_dbd71b496b7641b59d26d157f5806d37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/55481482172.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_7852dde06dae4080a10a02b69de6fb6d.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_314e53c3b63047efbc2e71d4e13831f8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BE7 5292 bytes
SHA-256: 0495a23244798570fee0af477169d7a538399c1d375b917d0808283729c1c98b
font_01_sfnt_off00021dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DD4 16276 bytes
SHA-256: b24e1ff3470f60cd48729d8cecb07ef430163fa3eee64bad9cf0be3c896ba09f
font_02_sfnt_off00024ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AC9 16100 bytes
SHA-256: ca476cbc654262556485e7b16aa381288a9cd01cc8f721a42365635087591cb9

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