Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c3e8259defe83f…

MALICIOUS

PDF

74.8 KB Created: 2020-11-14 00:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a47c2ed93d791d5aa83d1671e23ed74 SHA-1: 1730cd29c2a03d1872fa186b654dd34eef0920d5 SHA-256: e1c3e8259defe83fd1809b7bddc51d0d55a8de22914168ab2f4b5a78f0272bcb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable platforms like Weebly. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=sources+chaudes+pays+basque In PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/zifejodanaxikimisago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f87656330789.pdfIn PDF document text
    • https://dujopoda.weebly.com/uploads/1/3/0/7/130739119/28554863ba.pdfIn PDF document text
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/bfcd49b9035d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f90d85f37d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f8ea0d486a0d.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/6774791.pdfIn PDF document text
    • https://wabewubo.weebly.com/uploads/1/3/4/6/134670528/taxixuvofojumab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5f923aadc9d5b.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/4cf62c705707d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/toliwudalamem/aftermath_2014_korean_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/acet_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zisenogoxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/bovosatuzo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 5248 bytes
SHA-256: c750182a0df7f88a07e518995b4c551a6ba6ca4e0264b55cf8ae4156b53f8738
font_01_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10632 bytes
SHA-256: 29755cb9a8f9a59fc5879041384ad132525acb7f62cd8cea56ca54045f8d9e08
font_03_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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