Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3126cfb21256a4d…

MALICIOUS

PDF

78.8 KB Created: 2021-02-25 21:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 095ea0c4926f5c2aa57c73eea6bed19a SHA-1: 8b3f1029fd1860ae83031e3bb138352cf18f7844 SHA-256: b3126cfb21256a4de48edd231d908606f6337f13b22c03cab1de2226cd5dc0bb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, identified as a 'link farm', suggesting an attempt to manipulate search engine results or direct users to potentially malicious websites. The presence of embedded URLs further supports this, with one notable URL being https://baarspo.ru/strik. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=foodsaver+v3825+vacuum+sealer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426816/normal_5fd73ffbee7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/jijUhVb/ninamalawiwugixazo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415051/normal_5fe19c1773156.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/varapufum-maruzapumanok-vukonalofum-biradadefafoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_6007a43adbeb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_6000c4c0a9f02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fda6048651a3.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/idJUihi/13542305214.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/noxufewagif.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/deep_sparse_rectifier_neural_networks.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ffe84aa361d3.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegorarev/3vBZgew/11145319992.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/menawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/how_to_use_pictochat_on_ds_lite.pdfIn PDF document text
    • http://bukepajusoka.rf.gd/jowimotefon.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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 5716 bytes
SHA-256: 272453f3f8c5b76b2d9ced340edb53b9cfbdda1a27d40a71b0d8a5ae036e5ce6
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10640 bytes
SHA-256: 125418954c62e0de8575f7b063da1d90aa88d64741eba5f2385ed740acfb7d39

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