Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb2165931dc35a1…

MALICIOUS

PDF

109.8 KB Created: 2021-03-18 08:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5a132549607e6ae1d7b36481dbb1c1 SHA-1: de027e42f53dabed106ea58dc28579f8f34933f2 SHA-256: 6eb2165931dc35a1974e2e9b7acffa36a0a380b3c9d3128de1488b999c3622a8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary URL pointing to a link farm designed to mimic search results. This suggests a tactic to drive traffic to potentially malicious or ad-filled pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://soxebez.ru/award?keyword=aristotelian+syllogism+pdf
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fe6cf13d9426.pdf
    • http://tijudiwulewanuw.getenjoyment.net/learn_portuguese_brazilian.pdf
    • https://cdn-cms.f-static.net/uploads/4464527/normal_6037be716945d.pdf
    • https://static.s123-cdn-static.com/uploads/4447433/normal_6008ca951c39a.pdf
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5fd9e247a7493.pdf
    • https://cdn-cms.f-static.net/uploads/4386091/normal_602eabe83c4ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rutufokedizon/definition_of_economics_by_different_scholars.pdf
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_338fe63095c14d5d96d7cba644e5a5ef.pdf?index=true
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_280c512b3b1c4159bc7c1b697ea34a1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30c7f14d-eb5b-4a8a-8ffb-bf7fe8b5d34d/zozilikabilarojezej.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_831d11cd7e194d84ab4fb0eb5cb68484.pdf?index=true
    • https://s3.amazonaws.com/tudawufed/97184357310.pdf
    • https://uploads.strikinglycdn.com/files/f615d87f-37d8-4da7-b7b5-fa4c9c0bd164/25426371454.pdf
    • http://samajusinifako.atwebpages.com/imno_nacional_mexicano_en_nahuatl_letra.pdf
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_d9fdeded8eab4d22afc1e31127156f36.pdf?index=true
    • https://s3.amazonaws.com/guwutivupudutu/77621891981.pdf
    • https://uploads.strikinglycdn.com/files/560b060f-ab3f-4d7e-9756-7cf1a0030966/the_pact_film_explained.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_16d8de3603c546b49b6f6b0fce9ab603.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_6bc1a082fedf41eaa869110778687e17.pdf?index=true
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_64f12c65c6be4618b24ded198551f1d1.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_61d9406232e94e668b87b3ca5eff0675.pdf?index=true
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_d45e269be0e44464bc441d951d9713fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a78fee2-facf-4c56-bfa5-c2833daca7a9/what_does_e2_mean_on_my_pellet_stove.pdf
    • https://s3.amazonaws.com/goviwigax/bedodujur.pdf
    • https://s3.amazonaws.com/divexikav/bcbs_anthem_pre_authorization_form.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_off0001541c.bin
064b129db7b4c0c00707fd746e95e89f95ccd8efaec80c5d0357c690fe1b4842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1541C 5452 bytes
font_01_sfnt_off0001669c.bin
d71ea0ffb6facd445840f76f561e9d9256298c4d9370c86a13c4176c90b58057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1669C 13188 bytes
font_02_sfnt_off000192d1.bin
8470ca67e5d0bf8a9c57af03b973df5bdc60842fd3d5c292aa17b43e1505f0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192D1 16564 bytes

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