Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9e6d3f3f89f32c…

MALICIOUS

PDF

82.8 KB Created: 2021-03-09 09:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65122be6194618038cffba269c4ee7fd SHA-1: 4255cc586cc45ad5e7f991003a72d1269cd64ed8 SHA-256: fe9e6d3f3f89f32c1a1e0df935e2569f17845a7d1f99c2310b2323d6f25a7a00
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' and another flagging it as a 'recovery secret / private key request' lure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into revealing sensitive information or visiting malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://botokaw.ru/123?utm_term=mcent+browser+recharge+browser++apk
    • http://zozezobakuk.iblogger.org/fuwad.pdf
    • http://kulokozataxat.22web.org/document_to_word_converter.pdf
    • http://wameduxuka.iblogger.org/bpl_suchi_bihar.pdf
    • http://kawixepitit.iblogger.org/jamokegopitak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_8b74a233a1c14eb08b5166cb58f33643.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_940083cddb8745f79fc63cec5c4cbef6.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_4dc15065d6ff48b4aede63ddb5602344.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_fcf2f80d7aeb4a84a0baf0fa7ce607c7.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_2956d2876d9d48ffbf867efa0db8950f.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_e65b0c9f219241c1a48ccc5549b5ed7f.pdf?index=true
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_1de022a299794cb59eca07d808a26cbc.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_0bda640bdf214bf1bcae8bf58822f150.pdf?index=true
    • http://xifabopopotesa.epizy.com/tripac_apu_wont_start.pdf
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_da2fd2fbcec445a6b27d9ab1f1d599a3.pdf?index=true
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_8aca4993c6d44bceb8d8d410ed93b966.pdf?index=true
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_8733cdaa3d3b445eb413a84f22b4f06d.pdf?index=true
    • http://nivovagemesow.rf.gd/boulter_buderus_oil_boiler_manual.pdf
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_67e741c77e11442cb407dc34f94e019e.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_8031a1ce2fea4b9f8a77d3fe18cf2bc7.pdf?index=true
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_25418b4774b844c2a6690a5e9ba04a59.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_2e064cecf10f4682be556a3a3a7f966c.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_062bf1ab1d024da3add9905a638c3e33.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_00af679c54b249239cd5c4c17c1a1a5c.pdf?index=true
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_c09ea15aa7f4432a8ff3622b8f37b023.pdf?index=true
    • http://vubedarav.epizy.com/akuntansi_keuangan_menengah_berbasis_psak_buku_1.pdf
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_c82c6351f701489d956eb4d6be712eef.pdf?index=true
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_d9dd19e44d9e42b2973db558cb9cd064.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012001.bin
200f239b93ff7ab9f915c15492f7e976780812834089097fcf1b07faba3c0701		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12001 18460 bytes
font_00_sfnt_off0000ea08.bin
68a739ac952741f1c16f2dd74a628130f88295133810061a218bfcf08bb163a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5464 bytes
font_01_sfnt_off0000fcba.bin
7cdf9fc039b0a6cf48557312012a01e6a51ac3636608bd828053102cfaa2d187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 10364 bytes

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