Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b355258dad05ac…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 22:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 107a4779d8d30337414e0ada62023a18 SHA-1: 2c646f4f6e0c9c728509fa8f0a58792e4013daf2 SHA-256: 08b355258dad05acd76a48430db2b90fd6e2a114c0d1f9af7274ba5b5b4e4bdb
156 Risk Score

Malware Insights

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

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-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.
  • 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://jumiwimov.ru/strik?utm_term=what+is+the+message+of+the+shining PDF link annotation
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/2607420.pdfIn PDF document text
    • http://gojodefigogizib.iblogger.org/hp_pc_bios_update_failed.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/ropomotuzawutifi.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/9669177.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/pabinubotemo-rovilawumex-gelilu.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/658428.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/padosumifubobo/mudivinosifo.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_c20ca593f72e43d29b5cd735ae9c2e98.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_c95f66659734426882548a4d83754290.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_7bd31c7379874adfbf346d3cd260ba93.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_434639becfe744d8a1a89abcd9e95c6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/sikavukemogosebonipedi.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_bd6f461fcde84eb9845dea5ab80fb27e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/rirelidugexajisuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/crash_bandicoot_full_game_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/sorotixe.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_1f58909dba954ca7980754636a50a4a0.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_46fd3222df0d48fcae90a0043ba92d4b.pdf?index=trueIn PDF document text
    • http://jeropufa.epizy.com/probability_measure_theory_course.pdfIn PDF document text
    • http://pavebutom.epizy.com/wizard_of_legend_item_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/nupomupodagu.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_66293ab8b2864cd5911c3e83b68ffdac.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_8d4fb347ed3e40419f53d7e3ef992df8.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5068 bytes
SHA-256: ab88a3feb7a8906d98358f4af17af905dcf19c977fa46890708db2d83cb1a928
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11392 bytes
SHA-256: bbeadc778c8c4b0c0c2cfefb8eeb20e8fc80c605d45bd9e3e02cd7a55067261d

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