Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7514c1ad8d99ca…

MALICIOUS

PDF

101.6 KB Created: 2020-12-31 12:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3476057c6f74fd425db49a213039038 SHA-1: b74997e1c3aff7f98e18272e496bbcca17569ac8 SHA-256: 8e7514c1ad8d99cac5fe4bd901a1e3be73497efe7c1d38e83432c035ca3b42a8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=i+wish+you+were+here+meaning+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8e1d8a21407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5f9e00f7960dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fdedbbef3073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd66f2683ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5fb55a94de81d.pdfIn PDF document text
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/ximugikug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/kafutumarexuvozi.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/72215990633.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/fivadenemi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/ansys_apdl_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/mensagem_fernando_pessoa_espaol.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00015d71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15D71 18364 bytes
SHA-256: c2dcabf03e563186a0f62d768a6b46906b046000bcbb402f31068fcb63fb6666
font_00_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 3316 bytes
SHA-256: 2d92cdf1cb1c0c990d3d4ed3ba17c68c4c4bf308528fa69bd59b0b65852cc85f
font_01_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 5228 bytes
SHA-256: ef6cec4834d0a0dba285ef3e0471dc0540b9a331a73f854abebbd5f6e3ed62d8
font_02_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 2656 bytes
SHA-256: ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c
font_03_sfnt_off000101d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D7 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_04_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 2108 bytes
SHA-256: 5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52
font_05_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 2944 bytes
SHA-256: 0aa83e099ba7b6abfc433245d32bcfd4b4c3f928dcf6c287bdfbb1e92b756da5
font_06_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 5916 bytes
SHA-256: 65b84529e238c7e37e27d7f96edb44775ebfbd6aa3cc642a6db28fb9a6bd183f
font_07_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 15388 bytes
SHA-256: 0e0c4642fa7069a34f97386aab38b3eb28fc16e3683bc3b078216843ff20a732
font_09_sfnt_off00017aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ACA 2832 bytes
SHA-256: d7a1248cabf161ff78a072bd924b98f1b4e551660f4e151c9433689786990c0c