Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93377f860611cb4…

MALICIOUS

PDF

93.2 KB Created: 2021-02-25 15:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d8e9d364a3fbd418716e36d2ae1b72c5 SHA-1: 9a434bf9ce6c46542c39896705baad3283977a90 SHA-256: b93377f860611cb4b2983b01afce31ed8bdb8ab214efe5f8d7a2ebce28e1580f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily garbled, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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/award?keyword=little+taller+en+espa%25C3%25B1ol+que+significa In PDF document text
    • http://usacreditcheck.info/carmeuse_holding_sa_annual_report_2018llthv.pdfIn PDF document text
    • http://govnososal.xyz/parallelogram_math_worksheetsj098o.pdfIn PDF document text
    • http://wonder-ita.space/asseverazione_di_conformit_decreto_ingiuntivo_telematicorp78u.pdfIn PDF document text
    • http://requiredjokblog.com/63515407424i5dly.pdfIn PDF document text
    • http://smeshnoykir.space/starting_your_own_cleaning_business_how_much_to_chargesrhqe.pdfIn PDF document text
    • http://bettermoneytips.com/ikea_store_near_me_open_now85e5r.pdfIn PDF document text
    • http://apparently-home.com/mowugeruzunujerovitujunortvl7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fd0d3beb9e5f.pdfIn PDF document text
    • http://secureappeal.com/tupekivetujwp3ah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ff4a1d230690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://mevomum.epizy.com/dls_18_kits_psg.pdfIn PDF document text
    • http://kadinox.epizy.com/resasusafufuwuguro.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/94921736549.pdfIn PDF document text
    • http://gasunerumep.rf.gd/zuvugeresuzovuduwepesok.pdfIn PDF document text
    • http://fokafupu.rf.gd/96149996634.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 4076 bytes
SHA-256: 1cf81548dbfe215aa54796d3847225130f431dcf4636624d3810f67b9a56c183
font_01_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5464 bytes
SHA-256: a0963a44b8aff44a747dcb0fa43afe28492c1709383cb884a59558c92bdac088
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 8620 bytes
SHA-256: fb5fd95c6997255d042da9fa19a48ddd05b69ee0eb53ff53e4f3ce927ea218ed
font_03_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 12648 bytes
SHA-256: f16c3b6cbb27cbd05b0baa776f24f47b57857e87a9c7d97ff19a64d42db047ea
font_04_sfnt_off00014860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14860 17928 bytes
SHA-256: 7a4d75bec464d0a49cb5f221ec8d85cc2817baf2d81a3d2d4672e66b7addb1cb