Malicious PDF — malware analysis report

Static analysis result for SHA-256 9285612c97455838…

MALICIOUS

PDF

81.5 KB Created: 2021-02-27 22:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf28a94a69f50210121faf64f9edba2e SHA-1: d91f04dd329da379ba8a6f6d07f6595832805b15 SHA-256: 9285612c97455838f49a4bafdbbcac0def4ba5068dd3cd806c33a4bbfcfe9878
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and a high ML score. It contains numerous external links, with one pointing to a suspicious domain. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/strik?utm_term=%25C2%25BFcu%25C3%25A1l+es+la+fruta+que+tiene+m%25C3%25A1s+prote%25C3%25ADnas PDF link annotation
    • http://zuzorovix.scienceontheweb.net/donuzutagox.pdfIn PDF document text
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/1a577b4fbef.pdfIn PDF document text
    • https://gukikaxut.weebly.com/uploads/1/3/0/7/130775725/454e02e1.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/95ecceae0e.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/biseledogokel.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/sitozi/76982503658.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/lauren_ralph_lauren_sateen_sheets.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/23829332983.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/23671750929.pdfIn PDF document text
    • http://zufarelizija.epizy.com/biographies_and_autobiographies.pdfIn PDF document text
    • http://lefusalixa.epizy.com/toshiba_ipedge_reset_voicemail_password.pdfIn PDF document text
    • http://nomekerileme.epizy.com/37087557818.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/types_of_human_error_at_workplace.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/90668541666.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_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 5616 bytes
SHA-256: e05b09283e52b51b7897bc8d33540a3bbe8c1857fb302af3ea90aee5b475f21a
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 11588 bytes
SHA-256: 8938678361dd4837c11ff987048fc3ded3147b0fb95935f687f1981f1537105a

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