Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ae336cdd98784d…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 14:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bf8f58f5f581161966538c045cd27ae SHA-1: 68ebcb9d6d426d245b81a6f88f0535a7f74ba522 SHA-256: 66ae336cdd98784d57fd311154a65fbdd7109a5cb31c17513bdad5977ec8b9f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear legitimate, but one is flagged as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=present+continuous+active+passive+exercises+pdf
    • https://cdn.sqhk.co/lapefuxolu/VjPXIhQ/monir.pdf
    • https://cdn.sqhk.co/jovowosifo/jsab487/minecraft_basketball_arena_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600b3dcc10df7.pdf
    • http://gebameguw.iblogger.org/90317836942.pdf
    • http://gefaveje.22web.org/ampli_crown_xls_2500.pdf
    • http://jujiwaneko.iblogger.org/hygroma_colli_adalah.pdf
    • https://cdn.sqhk.co/gowamojon/1ijgiKE/37066881524.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_6011985ddc8e4.pdf
    • https://cdn-cms.f-static.net/uploads/4415936/normal_600c3bb36b3b2.pdf
    • http://wapajojakazewi.iblogger.org/36444782050.pdf
    • https://cdn.sqhk.co/samekikogeri/qxgjSHp/83309848915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_fd3c48056a5f4654b8c7058eed8dac23.pdf?index=true
    • https://s3.amazonaws.com/kozewuposoridil/bsc_online_registration_form_gujarat_university.pdf
    • https://s3.amazonaws.com/satulibaren/in_adams_fall_we_sinned_all_eviri.pdf
    • https://s3.amazonaws.com/fasudikek/guia_de_ejercicios_de_identidades_trigonometricas.pdf
    • http://bijamujijupife.epizy.com/samaxov.pdf
    • https://s3.amazonaws.com/rafiralexezol/gorurev.pdf
    • http://zomimek.epizy.com/fowuwixol.pdf
    • https://s3.amazonaws.com/vufuzewasi/an_introduction_to_the_history_of_psychology_hergenhahn_download.pdf
    • http://nejetetivapane.epizy.com/31623928192.pdf
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_fbf2b8343bbc41f4a1f1afcbed88fbb1.pdf?index=true
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_53413331834b41789fdd2d92021437cd.pdf?index=true
    • http://tugosujamas.rf.gd/aluta_gyration_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin
f6f03cbfbeed1b0bbf12625cff9447ffc3f9571699ab684327e2dfc3ecf94b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 5244 bytes
font_01_sfnt_off0000f53a.bin
7a957d40e2fa371729f12285f06344d1068513522b6b39a991a80f7fdedef8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 11036 bytes
font_02_sfnt_off00011ad3.bin
e2237bcfba2ad8a8c6238a86fe0fbf220db2b991d1f402b1dc0856d9f6c5f988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 16076 bytes

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