Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c227d77f9ee0d2…

MALICIOUS

PDF

102.6 KB Created: 2021-02-10 22:02:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a990184a5a507b54bb280ad69d02b7d9 SHA-1: 707187702941e33703f01fb67fb9fc87d0dd6f42 SHA-256: 24c227d77f9ee0d2dc938c289654c1adb773b5475de6addcad820c28cfe7bdcb
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 other PDF files, suggesting a link farm or a method to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM rule suggest the document is designed to host or link to malicious payloads, potentially disguised as job descriptions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/123?utm_term=dragon+ball+dokkan+battle+mod+apk+4.8.5 PDF link annotation
    • https://cdn.sqhk.co/nizekidido/uhdjjXN/86959268453.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/vovadotoni-fesosagivaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5febd053f3df9.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/xutub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_601b61bd6a90d.pdfIn PDF document text
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/3204287.pdfIn PDF document text
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/3090783.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/paxunu/barman_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/36413844193.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/86662457718.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/rajukefemevivipegela.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 5740 bytes
SHA-256: 6c8cb055107b8357f57670c3a76336e34930560dc9db3794887eaa1ab4edf1c2
font_01_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 6392 bytes
SHA-256: d2c2398c6c392b31df93c19cf7d158168cc5c2cf335b1be08191faa0d821a00b
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 14376 bytes
SHA-256: 8ef043e7c39f2063b637b4c59d9b90591666012de836eae9f3c74b9fee7a0fcf
font_03_sfnt_off000174f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174F5 17372 bytes
SHA-256: eb3c4654df814c02441bc5e3990db80392baffcc047c77c096b685099069024a

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