Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c74c544700361f…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 18:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf62b34f10398455c0feb7fdad647e33 SHA-1: 10f9c33e3bf5677c383ff7d08f22668030aee970 SHA-256: d7c74c544700361f100c7a242f4ef0049125a0faa3a881ceafd3fc936b066b89
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/123?utm_term=the+real+tiger+south+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fd250835e7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_603bbd8bbe4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_60415748193f6.pdfIn PDF document text
    • https://kazilapematif.weebly.com/uploads/1/3/5/2/135293457/0e65e4752eb2b33.pdfIn PDF document text
    • http://mapenibo.scienceontheweb.net/741_operational_amplifier_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5fe786c1a38c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366008/normal_5fe1389dd45ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_6006f0afd03b9.pdfIn PDF document text
    • https://sisuveraxom.weebly.com/uploads/1/3/2/7/132740665/6484012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_600678ae3a3a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5fc80053bf670.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/nunigazazusowatusoj.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/cant_pair_jaybird_with_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_6012dbb167ead.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5feafc6ba6e69.pdfIn PDF document text
    • https://mutefalififide.weebly.com/uploads/1/3/1/3/131383766/7ab6dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_60612917d61de.pdfIn PDF document text
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/1172251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_81427f6da61f4b97978b13905ca4cd32.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_8632b6e8517f4bdb9cb279c07170b7cc.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_16c8644693424073a24e885487cb916e.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_61be9dca343c4057b7bdb69da54b2658.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_b43f0c683da848ff9388313ac0355559.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 5188 bytes
SHA-256: 7eeb3bebcd2a59e00cfd7cc1bc67636331acf2d0eb57b33d7dcc801707682d39
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10976 bytes
SHA-256: f6bd2a253fca0b06279f7e8aeafbef712c919b05d22b94284cc5d69a3eca70ae
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8