Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6868bc90898b58…

MALICIOUS

PDF

89.4 KB Created: 2021-05-27 05:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e2f34ce735655b65b5184560b1a05d1 SHA-1: df1de639cf14bb1285823de3c83c999bac16cbe5 SHA-256: ff6868bc90898b58a201d0558a6bbf8ad6a1094b7df03642a7990506070c19da
226 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. It uses a password-protected-archive lure. 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 0.9985

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/strik?utm_term=samsung+galaxy+j2+firmware+free+download PDF link annotation
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/dugelizaxek.pdfIn PDF document text
    • https://lupobola.weebly.com/uploads/1/3/3/9/133999804/mefuwof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff389f622b0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_60046ae0df9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60581b59b9924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5fcef960f35b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_60103ab60b4ee.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/10f97afd8d5fc.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/pozigukewe_nivobodudamo_wibazajuvovagav_javusavob.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/9629649.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/nisigawijulowe-fasukufimef-lomusobofu-tupuxesur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5feb692fc8bef.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/kodubibupusosuw.pdfIn PDF document text
    • https://pibazafefudo.weebly.com/uploads/1/3/0/7/130776509/8a1bba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fede720ab889.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6bd47c37-abb7-4ac7-93f2-8ab6cac67741/xipasawobolozaden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f1c4d6-3869-4612-bd7f-9a4332b0ec63/singular_and_plural_nouns_worksheets_grade_1_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca87c51-6ada-4cec-ab24-f6c88e0230fa/steamed_chicken_broccoli_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982427cd-dd7f-41e9-a2bb-1c04dee3bd1a/gitetuvoginugakedekemej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5daea71-9fd3-4c8e-b31b-5c9c18ed52a2/66953569748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef03afe8-fe38-4add-9c88-75f81fc566ce/fruits_of_a_poisonous_tree_doctrine_defined.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d4682c-4d75-4bb5-af1e-e275e8875c8c/87305246375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd37bf7f-c8f3-43de-846f-6d581748021d/sosafodeva.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 5600 bytes
SHA-256: c4dec345d93360280aaf5ad644a0278a6616a9ce2ad668b537a7e957d35bee6f
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 12052 bytes
SHA-256: 7c3df83924c3de3bb5708d8335ef31cf5e3b3b2eacde13be27a430439773fd1b
font_02_sfnt_off0001341a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341A 16272 bytes
SHA-256: a7b1e01542dab829d2ba5dd7846da79335ded9f65a948c274aeb683100f5fd08
font_03_sfnt_off00014981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14981 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378