Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f54d2f609ab1ed7…

MALICIOUS

PDF

86.4 KB Created: 2021-02-14 15:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7d0b3f569ccf4840d0cf2b70ad4e1c93 SHA-1: 6903158a895349c940ed4ec69e1e5c13d4f8b2e8 SHA-256: 0f54d2f609ab1ed79d8ba8e7483d1ab1c8f9971e463aaf2cc8d70d405e728a95
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly flagged this sample. The document body is heavily obfuscated and contains junk data, but the primary function appears to be directing users to a multitude of external URLs, many hosted on disposable domains, which is a common tactic for SEO manipulation or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=desert+words+that+start+with+v In PDF document text
    • https://seremojalunukeb.weebly.com/uploads/1/3/5/3/135393353/gadomasesazi_fawebadi_kugum_govimotore.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/pukinazir.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/duveku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fdbec46b2db1.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/ddba8a819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_5fc9e38a48ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_60288d6540c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fd8ffa02eec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_60008d3ba8dba.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/jezisosododavudago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fd974079b601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_6000db3972f0d.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/6027439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadusevi.rf.gd/aula_internacional_1_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 5032 bytes
SHA-256: 398c0253440c6aa6fa3c9c7cf8fe6f0f6d7b33e5de492c74e2e076d598a5e4a7
font_01_sfnt_off000119f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F0 3588 bytes
SHA-256: c3653f686d5bffef81fb34db2cad970a5e993236812e7958cf6f7c97793abbb7
font_02_sfnt_off000127d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D5 10132 bytes
SHA-256: c6f821630cc2449d8fd32fa4fd004aad4578a7eb38b413c0c8b4581ee199ba61

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