Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d11120af7b969c8…

MALICIOUS

PDF

75.0 KB Created: 2021-05-11 17:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3c19052b0e22069fcaa67999c9c1acdd SHA-1: bc91611454b2b550dd1c0d4fa18f33c1fabb3172 SHA-256: 8d11120af7b969c84e18d94eac13995d7431258cf31ff33a3e0996f44ba3edc0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The primary malicious URL is https://seumenha.ru/strik?utm_term=passive+voice+present+simple+exercises+pdf+perfect+english+grammar, which is likely used to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://seumenha.ru/strik?utm_term=passive+voice+present+simple+exercises+pdf+perfect+english+grammar PDF link annotation
    • http://dokakepitizix.medianewsonline.com/star_wars_incredible_cross_sections_attack_of_the_clones.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/napoleon_bonaparte.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/simple_explanation_finite_element_method.pdfIn PDF document text
    • https://kotogafisix.weebly.com/uploads/1/3/0/7/130740127/7669923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5ff0230b7acf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fd1c749a5576.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/dokuzofakekolefumejo.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/7ec81589-40db-46ae-9ea6-9e4fce0ac9b3/81477823949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec825bc1-4e1c-41b0-b36e-fb091761e9c9/97939761703.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/worakunozogunub.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/93061122479.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/ditoxeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c509857f-a4e7-43c1-8fb3-4f33b362d329/loxaxipomoguwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/basic_techniques_in_molecular_biology_stefan_surzycki.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/someone_like_you_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2d94d6-4cc8-43f8-a23a-3a953440a924/bavinokawuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/76513933701.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/conservation_of_mass_worksheet_physical_science_if8767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90f7aef-673a-4110-bb9a-1fd50c6ee9be/amor_en_tiempos_del_clera_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/remawip.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/fifth_grade_worksheets_math.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5696 bytes
SHA-256: 3dd87b1c523ae97bd5878dd75a0cbd0f837293b82184c65efa465946a762057f
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10692 bytes
SHA-256: 0acdbcdf699256fb76365f487d2abf4eda357e4f2ed2d409cdc264f82d420706

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