Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ccd0d76f8ba1e…

MALICIOUS

PDF

73.1 KB Created: 2021-02-25 18:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d36e7c09edc37e121b1917097bb2e59 SHA-1: da2fb5ed8f612cf94b8694f154bd75c232a9bc8d SHA-256: f42ccd0d76f8ba1e481fa761550330d4fa24f0a1f4d54e10e7a99a72990195bb
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malicious content delivery mechanism, indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. It contains a large farm of external links, with one prominent URL being 'https://druttle.ru/wix?keyword=geometry+dash+world+mod+apk+revdl', suggesting a lure to download potentially harmful content. The presence of numerous external links points towards an attempt to manipulate search engine results or redirect users to malicious sites, aligning with T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=geometry+dash+world+mod+apk+revdl PDF link annotation
    • http://fofiwafajelerax.sportsontheweb.net/gunonagerisemulejevevaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_60301843ab6af.pdfIn PDF document text
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/suzuzuxelemagad_fivuros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_60321ba6271a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd924f022d13.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/nijosinizo/badumagewemazovibawokun.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/ccna_cyber_ops_lab_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/mssql_backup_with_format.pdfIn PDF document text
    • http://sunoxif.rf.gd/bugurebomu.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/37673318725.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/wow_classic_herbalism_guide_1-_300.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/netgear_readynas_nv_v2_specs.pdfIn PDF document text
    • http://buvajelu.rf.gd/necchi_supernova_manual.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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 5548 bytes
SHA-256: 06a87838dd7a557b50de8f0a69246fdc3dc3dba241576f25d6a6274f70411a85
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 10416 bytes
SHA-256: a60296e373ec713c96f6a30069cf13e1a5660c769e0eed2539701e2d7569cdb2

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