Malicious PDF — malware analysis report

Static analysis result for SHA-256 623788a1b74fef8a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 10:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c289428fbc2bea06cb086a97e05f1912 SHA-1: 48eac839d4250d3543643e0f1afaa6503216f3df SHA-256: 623788a1b74fef8acda6a69c30f37cc970d56bfda34500f00a45ef7978d1cf96
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature. The document body, though heavily corrupted, contains a title that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=how+to+draw+anime+boy+with+hoodie PDF link annotation
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/48e9444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_5fd711b2e1e4a.pdfIn PDF document text
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/a32bd5.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/faxujow_buzonuxazuno.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/2927151.pdfIn PDF document text
    • http://vinnipoh.fun/january_2019_monthly_calendar_template_excelx7v44.pdfIn PDF document text
    • http://jumbochecker.com/root_words_for_greavb59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448100/normal_5ff9f888928f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fe435ea70783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_600e52664932f.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/gajojemarapaveruweze.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/vibajotopikidefifixu.pdfIn PDF document text
    • https://bonawuxuje.weebly.com/uploads/1/3/0/7/130776103/moxizolekuteg.pdfIn PDF document text
    • http://legalvictory.group/lejolisepetaxipuwobh83f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5ff5776e2a134.pdfIn PDF document text
    • http://rameautbxy.space/25665070184it1xj.pdfIn PDF document text
    • https://rasajelisulozin.weebly.com/uploads/1/3/1/6/131637016/5c3d56349631118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5feeb0528ddc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fdf2ca3f2618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 5152 bytes
SHA-256: d10c5c78fc7b53fc62b455949990d76ad1df701e9aa49efb4e2e721f6f7ddfac
font_01_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 9740 bytes
SHA-256: ee0ea27291698b22ea1153a006ba17ad11efdaf883cc698cf79ebadb471d1a06

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