Malicious PDF — malware analysis report

Static analysis result for SHA-256 221378d27e646c76…

MALICIOUS

PDF

41.8 KB Created: 2020-10-14 05:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4f2765305253146c08a53e374971d60 SHA-1: f68ee7b4c2c20fcbf3dad28b7155c423970a24b6 SHA-256: 221378d27e646c765c9d50fdfeaeaf0e345e12440bc576bc786059af64660096
192 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector infrastructure, indicating a potential for malware distribution or phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=psychologie+sociale+cours+pdf In PDF document text
    • https://site-1043763.mozfiles.com/files/1043763/10313426132.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/xoxediwanovidow.pdfIn PDF document text
    • https://site-1037916.mozfiles.com/files/1037916/dobuwigar.pdfIn PDF document text
    • https://site-1041937.mozfiles.com/files/1041937/73991007837.pdfIn PDF document text
    • https://site-1043694.mozfiles.com/files/1043694/nelowezafatufotome.pdfIn PDF document text
    • https://site-1037143.mozfiles.com/files/1037143/xexegufavunovozu.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/difadenilagexa.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6839/0046/files/92467343379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/67962723822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2991/2488/files/sojanekebon.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_off000060f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F6 5520 bytes
SHA-256: 44aca3f3ffec60bc7282b8eeb1bb8701ba215207a3b89f170ecef3d19946dee7
font_01_sfnt_off000073b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B1 12128 bytes
SHA-256: e737a21c1caa5467898ec76255dca2fea8be2dcd24a2624b5c78c9395530a1cb

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