Malicious PDF — malware analysis report

Static analysis result for SHA-256 a876a268850d9d90…

MALICIOUS

PDF

87.3 KB Created: 2021-03-14 23:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a217fb131375fbab05b0d82282a86a51 SHA-1: 29a1455144fd881f230feaae48dd4561b05f7216 SHA-256: a876a268850d9d906a0116d19e84d3fed2d41469c6715efe6534cc83fa203946
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 0.9989

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://nipisod.ru/wix?keyword=my+english+by+julia+alvarez PDF link annotation
    • http://soxiwokix.iblogger.org/63702784152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_603602b4edc42.pdfIn PDF document text
    • http://keep-travel.com/zumoturipelieh8jc.pdfIn PDF document text
    • http://potenciy.xyz/16562678375he0ob.pdfIn PDF document text
    • http://mailedflkf.site/bazaputeguzo74jw6.pdfIn PDF document text
    • http://motawosofi.iblogger.org/nalosobejulukul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5ffabdf0e1df4.pdfIn PDF document text
    • http://rineset.xyz/5222757447j4y34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_5fe7af4fcb3b8.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/xiwibe-desobopa-sareso-pubes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_60162163948b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_602728c960921.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/rerojamotu_fagidanaponena.pdfIn PDF document text
    • http://vodoroding.info/1396893010wh7j7.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/fadipudorafibi_tibulara_lafef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_8097e0be1ed144cf878f1902a07579b8.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_1053b39acd1c411eb37c56d7e59db0ee.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_440b460039914a7cadd39a75b06c0468.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_329bd71fd9df4da9bc6d1f8d372c4c11.pdf?index=trueIn PDF document text
    • http://futebupolidasuk.epizy.com/kitoserolanimapinu.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_76a59e29ee414b61bc063511cd7ee2d0.pdf?index=trueIn PDF document text
    • http://jixakobapufu.epizy.com/jirutiripawirafimujikira.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_6165b082ef5e4e7bb88bb5ec0ed40de9.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_27ac1056c3af4d20bea542504461d070.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a17107230fb74cfc8e109f1d4c1e6dd6.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_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 5380 bytes
SHA-256: cd1ae42efcc09eba9d6f424c2ff8bd29ff32549ea8432dbb2348b4d9618d2949
font_01_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 12264 bytes
SHA-256: 56879032e6bee358c12ad60396711d5b08eb7541f00fba2342dd394de751d022
font_02_sfnt_off00013a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A17 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15