Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437eb3ca049b858…

MALICIOUS

PDF

105.0 KB Created: 2021-01-19 03:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1fb4e3f897011e193b2850bac2366d76 SHA-1: 730385b7a309cd359ef1ffef24f4baee7d2c15df SHA-256: c437eb3ca049b858b0b6276605170e847bae0d81aa57dcf9672aa98086c3924e
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous links to external PDF files. One of these links, https://ggtraff.ru/123?utm_term=papa%2527s+games+unblocked+cheeseria, points to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be a lure related to 'Papa's games unblocked cheeseria'. The primary function seems to be redirecting users to potentially malicious content or participating in SEO link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/123?utm_term=papa%2527s+games+unblocked+cheeseria In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5faaa6a75bfe5.pdfIn PDF document text
    • https://ragulifogikub.weebly.com/uploads/1/3/3/9/133986704/6cb4b.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/4657016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f870ed6ba5d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5ff16f1367a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5fd172938941a.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/59f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_5fc21d5d489d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8bcebe5b511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe50b662f40d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_600397efba896.pdfIn PDF document text
    • https://lagonola.weebly.com/uploads/1/3/4/8/134851586/8bf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f871582195f9.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/diwojolupajolepezu.pdfIn PDF document text
    • https://fekubikutoji.weebly.com/uploads/1/3/4/1/134108901/e793c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5fc735284aae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fupuvafibip.rf.gd/status_for_whatsapp_in_marathi_free.pdfIn PDF document text
    • http://lonivone.rf.gd/simple_business_case_format_template.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001839f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1839F 6504 bytes
SHA-256: f8ebae8ea2381a5f5a5db4f03c6c737f92a142e66c67ccbdc2f7fea2b5259cac
font_00_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 7516 bytes
SHA-256: 76f34301b0f0f3260df63e8e06ee417912ceebc1ec9b161224d906abd4afa021
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 3220 bytes
SHA-256: e73378a5b35c624f5e06081debd16ed7515a56f0bda7f63219d5d7a05719cfe6
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5724 bytes
SHA-256: 5a7cc4231cc86d4fe671e2d41c6cfdbfe1752dfa9b4cbcb484832ae8f9c41c1e
font_03_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 6280 bytes
SHA-256: a3b179770175167fc105d601e782d97fe9fd5fdbff0be5084ea02020e73dba2c
font_04_sfnt_off0001381c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381C 17692 bytes
SHA-256: 95b17feae42a8cd9d5720d62d6af7434a07c1ba84dc63111423829b455918454
font_05_sfnt_off00016d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D00 16516 bytes
SHA-256: f3bf7d65e83e0dc75c5df7c05093edf1192c13d377daee4cf108b80aa32c4637

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