Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf5dcb83e9d6e1…

MALICIOUS

PDF

68.2 KB Created: 2020-11-22 03:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2eac7fa728af1a2a2934a0fd8f34b4f5 SHA-1: 74b496f5375b42ff04e39192384326aeb0da97ed SHA-256: 16bf5dcb83e9d6e1e11a69c198a782cab466903b6b393b065f286e7edbe68ba2
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. The primary malicious link, 'https://traffking.ru/123?utm_term=ryan+homes+guardian+security', is flagged as a known malicious redirector. This indicates the document is likely designed to lure users to malicious sites, potentially for phishing or to download further malware, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=ryan+homes+guardian+security In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f8df5cb4254c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f9329b2158c2.pdfIn PDF document text
    • https://dajedenutiwifux.weebly.com/uploads/1/3/4/3/134318988/kopififaw.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/24bf515.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/guxolibar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5f895f35cff2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5fb931841439b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5f90b921e6fa2.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7421535.pdfIn PDF document text
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/5075021.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/043f03a.pdfIn PDF document text
    • https://vukaxibunima.weebly.com/uploads/1/3/4/8/134885707/7282576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fa0f9900ee6f.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/setikizo/bccdc_immunization_guide.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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 5312 bytes
SHA-256: bdbc13e637689284563da38371e16e18e6a208252652501b51397ace019f439f
font_01_sfnt_off0000d2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C8 10124 bytes
SHA-256: 4572f4004b1097a15576ff3dc0d1a47d7b0ddf182c24d5cc3573889426ca0bb7
font_02_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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