Malicious PDF — malware analysis report

Static analysis result for SHA-256 a753fdabfb690b30…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 16:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7bccd7b7f8978d97bd1162c05fa31ab SHA-1: 2cc61fb0c6e038c8c903d01c528b7c225fae492a SHA-256: a753fdabfb690b304ff772b3f20f663e1f8389f0356c6a13a6460efa09a3706f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/wix?keyword=coordinate+plane+distances+worksheet PDF link annotation
    • http://rankingcoach-seo.com/jixometelelanamemkktv5.pdfIn PDF document text
    • http://ribozigokadime.iblogger.org/mass_of_creation_memorial_acclamation.pdfIn PDF document text
    • http://reggis.info/82403694311k0s8q.pdfIn PDF document text
    • http://pro-gram.pro/84411468157deduz.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/fesafefo.pdfIn PDF document text
    • http://hairsprof.ru/36440721181ud25m.pdfIn PDF document text
    • http://basijinogasa.22web.org/wordpress_download_monitor_multiple_files.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judewal.rf.gd/the_things_they_carried_social_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb1861c-4a6c-4067-88e2-0372f43ff141/38807586260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91019d0-037d-4ef0-b040-9e87ed014d52/88132351192.pdfIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/migugon.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/66435856539.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/35768876773.pdfIn PDF document text
    • http://zotobiwew.rf.gd/15137720265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851974ca-f5fd-435c-a891-50610e0a0815/zifez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110de6e9-fb43-480d-9c33-61b2e649c4ee/simply_keto_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/36706568721.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/demonstrative_pronouns_worksheet_with_pictures.pdfIn PDF document text
    • http://vizokipinebawik.rf.gd/thailand_visa_on_arrival_form_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8250a797-061c-4b55-8f92-e1237eeba8c0/duwuwarizadonupukuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2b1ed4-19db-4c80-906b-5e626d2c9910/28996478424.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/103880206.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 8032 bytes
SHA-256: 74c9e48312f64ff7d1f23e8fbca5fdd1f283f9ad37ed8297ec87127e3b9cfc38
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 1964 bytes
SHA-256: 86ee88d2f479c7f6b33757b58910aef28daaa9d9b736dd12981443c8e7ba2ecf
font_02_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 5220 bytes
SHA-256: dc2fa4ab89fcb16ddaa8bc52e2ba6367c33d920afde9a733bd7ec9663f0448ea
font_03_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 10596 bytes
SHA-256: a8c3fc95ee473274dadf6840241d850a19665b2d20cb89be31972f59b406b93b