Malicious PDF — malware analysis report

Static analysis result for SHA-256 2671390fffa3c23e…

MALICIOUS

PDF

141.4 KB Created: 2021-01-24 12:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8632ae5f985bf3bab71c879015d95424 SHA-1: 28a331648f358eaf978920c6ad1e5a252ec31a24 SHA-256: 2671390fffa3c23e612c9685901a793333e9103464b1f7d33e16c20fbefda273
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified this as a PDF link farm, and ClamAV detected it as a phishing trojan. The embedded document body text, though corrupted, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool for creating PDFs, and the presence of external URIs suggests an attempt to redirect the user to malicious content.

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://seumenha.ru/aws?utm_term=bearing+skf+catalogue+pdf PDF link annotation
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/jazoge_piduna.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/jifipar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_5fdfa6e1859c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5ffb4d018ec29.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/lifowibe.pdfIn PDF document text
    • http://drawer.icu/kirimajowis41hcy.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/9561044.pdfIn PDF document text
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/tiritutojelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fc5e487b55f9.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/dosazikinalubudulu.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/lorifawuvawot/criminal_record_check_manitoba_form.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/wamsutta_fitted_sheet_bed_bath_and_beyond.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/mebegunulenek.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/64935286359.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/smtp_mail_tester.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/rovajivepakegeximuge.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/final_fantasy_14_shadowbringers_dragoon_guide.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
    • 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_off0001d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D398 5436 bytes
SHA-256: 1549b413f7e61c248b6ca3990a205e539710812595fe09c7e044c5b565cf1287
font_01_sfnt_off0001e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E62E 13912 bytes
SHA-256: 964988f1c1ddd6910ee1963028fb009212a8385117361a5c906e4e848523699e
font_02_sfnt_off00021397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21397 16060 bytes
SHA-256: dd623c2e4b2147c2f7333d3c498093e2ac050c7884d0c32cc27f4d3210532701

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