Malicious PDF — malware analysis report

Static analysis result for SHA-256 035078d969efcad3…

MALICIOUS

PDF

70.8 KB Created: 2021-02-14 18:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 46e721ad0b5b4201a1382e9bac4c7f27 SHA-1: bf27e9c81b0c4bb2dcc3af4fd526771c0ffb3ad9 SHA-256: 035078d969efcad36efdb3f86829100db2275412d2c01f38b98f30c68b6b3958
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or suspicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The 'PDF_SEO_LINK_FARM' heuristic indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were extracted, the structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=oceana+pool+league In PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/jinokezezobure.pdfIn PDF document text
    • http://shoop-fl.ru/vsphere_client_5._5_freeikb38.pdfIn PDF document text
    • http://wordsideget.top/9637420593xyvps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_600db832a44f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fe305a12f4ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5fc6ac6676f4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407069/normal_5ff7b6fab1664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5ff6530f10c86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_5fdac79a329ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_5ffb214775923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_5ffa6da5c5cb2.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/b97cfa.pdfIn PDF document text
    • https://gebapawuvafiv.weebly.com/uploads/1/3/4/5/134519736/ba052c574250ec1.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/gogonof/john_deere_tractor_color_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/13203365643.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/cellule_vegetale.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/celtx_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/jejusuzuzovo.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 4852 bytes
SHA-256: b3cb559b247326ebe1c3d477e54691f483bd4b08387bbc285b0d4d6194eeb46f
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 10676 bytes
SHA-256: e20d95b9adc2fc1958a7c70620021aeb22e77932e78c39c0087d79d6e2226502

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