Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e1161db83c4846…

MALICIOUS

PDF

73.6 KB Created: 2021-03-16 07:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06cbdb3ed1f3bf601a387a321e286737 SHA-1: 15ea622847738fb3892c9e908433974b466a72df SHA-256: 51e1161db83c4846b562067affbedb66f2dba453d9a5b15dc0a4f8f91349dbc1
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The presence of a 'download button' lure further supports a phishing or social engineering attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely to download further malware.

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 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://yafferge.ru/aws?utm_term=rinnai+r85+installation+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_60380e1338e13.pdfIn PDF document text
    • http://daddytestit.xyz/what_is_the_most_important_part_of_writing_a_professional_emailhkm06.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/bailout_nation.pdfIn PDF document text
    • http://bluebadge-support.com/sajijobejufotoxasoboso0tf0o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fde9d489e196.pdfIn PDF document text
    • http://fb-ig-copyright.com/xetosunolak9xdq4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5fe7468505927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_6004be793da75.pdfIn PDF document text
    • http://craftsmansmetics.com/cadivi_catalogzpe7n.pdfIn PDF document text
    • http://wegixaro.iblogger.org/laxusivoperi.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/dowuxav.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/chiller_hitachi_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7f8cab-c0fb-4308-a34e-9dcc7a797fa5/kivusukug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba689c3-16c9-4669-a525-1bbce01233c8/tadukaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae408833-cc43-444d-8710-77e07fc11c77/bupebozuson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b15c04-b97d-4ba5-b6f3-9ddb53cf34c1/58923375355.pdfIn PDF document text
    • http://poxotoromerolu.rf.gd/vizuranana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d610a54a-b69c-4c87-965d-2a6af37d94c3/videdibuwepizexidoloxeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f65671-d0d9-4dd4-8722-7ce724811e10/what_are_some_examples_of_linking_verbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ff04f8-08ec-4b35-a31a-2db480d74d5a/28465580319.pdfIn PDF document text
    • http://feferabi.atwebpages.com/psychological_assessment_specialists_pllc_pocatello_id.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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5156 bytes
SHA-256: f421516d91d1a5b53da91dac72000d360382ea9713be99e3628aba53278110e9
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 10600 bytes
SHA-256: f409eb53b9e7d5c7cee3eba875f67a493d57a492b7f1372d67de0d8fcffd9c46