Malicious PDF — malware analysis report

Static analysis result for SHA-256 4914ea250035adc6…

MALICIOUS

PDF

83.0 KB Created: 2021-03-19 17:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 37c6fba0e8dab8c6687cfbcdf16bf634 SHA-1: 8a5be45d84a660d377f75be7dcbbd256525a7690 SHA-256: 4914ea250035adc64d688a52f08332c299940659a165b30a653f32465704d262
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=very+clothing+size+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225c3b24faa.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/dcc6919ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5ff5d0ba2ceef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fef7dbc4e10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6042d5c871145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60274b9878e5b.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/09cfd114025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fd375fce3b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_603ac4b0efab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_5fd1bfd52567c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_602bed40524c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_603ee48f73793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd7502641152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_60155523e4287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_603f8c08066aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_5c88ee10e74742b3bae04a447f84af5e.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_dbd12abb7d574d42b8686b80e7eb816c.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_c0f1526a4b754aff84da1800f1bf4ff8.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_40d3756b250c434d8cd6a0a5d82f5d5e.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_916b0932245e44a193c1db93de20cc80.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_62425b793f5f4bf1861cfcf5ed5c9790.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_b428a7fc284f4d6f919978d33119414d.pdf?index=trueIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_062283abfe1b47d3bd40fc4a7b508e4d.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_4d77eb4d7e3745198f958aeea2dd9f94.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 5108 bytes
SHA-256: 6b7efb260aa7cda68df422b460516f0f7d47d6dee8f0a1c939bbb7e48a1ac16f
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 7256 bytes
SHA-256: 32a65ce6f9664b58344a4fe5219ccdfbdaf98c740b23412bb2b71e4aaff42e2b
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 11100 bytes
SHA-256: 77ba564fc97825090fb1a3272c597cce2f84d50fe35507c71b615eb745eb3276