Malicious PDF — malware analysis report

Static analysis result for SHA-256 529bead356969d32…

MALICIOUS

PDF

55.9 KB Created: 2020-11-09 14:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 636c00feb6b300afc0d025cb6b6ccb73 SHA-1: 2da193fd9b32fff0ebf549af649cd954f84fdd88 SHA-256: 529bead356969d32855bd3a2502cd688429b20b994f5bbd0bc8e03a071d75313
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that directs users to a page discussing jailbreaking iOS apps, suggesting a phishing or scam lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, many of which are likely malicious or part of a link farm. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffine.ru/strik?keyword=best+jailbreak+app+ios+12 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5f9313fb19421.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/05d8e0.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/bd8eda30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5f9c96ff9a315.pdfIn PDF document text
    • https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/2799112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_5fa232d76e2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5fa5af066e71e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de06277c-b6c6-4716-bc21-f7a9097e10dc/wetazov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1b05d1-0472-4716-ac26-916961f63f80/tumezuvikupika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7a9210-7fbc-465b-9a20-2bdc36d882d6/10163907080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975005ff-f537-485e-a117-f5100ad656b7/28473624832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad002ddc-cda7-4dc5-968d-f41a0466c2aa/un_aller_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce843db7-4f41-458f-b913-1fa3d2049ee6/vujiwugemubikulemojizi.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_off0000830c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830C 5328 bytes
SHA-256: c47973c9fd71f2f7d412a40ec399dbe98f98558394cd29b57a2016b1f3c1d0e7
font_01_sfnt_off00009541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9541 11544 bytes
SHA-256: f14b7bedce6858691b0b0ce64b4ffa23c82d2128f6e8a4bb0c23d3cb30385183
font_02_sfnt_off0000bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB9 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826

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