Malicious PDF — malware analysis report

Static analysis result for SHA-256 0647a8fd6ae5ffaf…

MALICIOUS

PDF

85.1 KB Created: 2021-03-25 17:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fa45f041fed9ba0526b4d0c42fa49653 SHA-1: 090d6de5c13b809574116aaf9e073be7e73bc56a SHA-256: 0647a8fd6ae5ffaf024cec603660f8a4c1d221adf8db218ff7bf7f0955da51b9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm with numerous external URLs, including one that appears to be a search result lure. The PDF's structure and embedded links suggest it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pelibifir.ru/strik?utm_term=what+is+meant+by+multivariate+regression+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418968/normal_60133e4071076.pdfIn PDF document text
    • https://famimiketavow.weebly.com/uploads/1/3/0/8/130873946/kopomo_dizigajuxofo_kokan_jelokefoleka.pdfIn PDF document text
    • http://carins.info/6998228468o2u4l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_604d8643518c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fecc2e4dedc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_604ba4f21e6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6037e1f901c6a.pdfIn PDF document text
    • http://liolika-rsya.ru/422081417922upyr.pdfIn PDF document text
    • https://vumuzuvi.weebly.com/uploads/1/3/4/5/134506571/vazuxugejetasodesa.pdfIn PDF document text
    • http://fherixq.com/a_first_course_in_differential_equations_11th_edition_by_dennis_zillkly6q.pdfIn PDF document text
    • http://premiumpornclips.com/is_genetic_testing_worth_it_for_pregnancyl855y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_603f68029cb7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_60477180e43a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_602ee6d234019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fd9a11ce9786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5fcdef0bb2aaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_02106bac481e424f80df4c978f8cf981.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/kuganivorojikesurizeli.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/bivariate_gaussian.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_d8d307307386487c898b7d4b79540ef4.pdf?index=trueIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_f0ec863a219c4618b3beee5704c9e55c.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_6397a4d8e676442abddf8cb47bd9891f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/cox_cable_tv_guide_phoenix_az.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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 5416 bytes
SHA-256: 912b70f44caa29f3cbab44540a50adf9fa8040ccb3ff2e590d38e712ae913c0a
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 2172 bytes
SHA-256: fd5dcd9ba48ff15015509b708a9a8eb28212cffbdeeb6baf7492f7788fe52a9a
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 11964 bytes
SHA-256: 0ffeeee25fa66d696679b6dd282467a126c8353a3e4ecca8944e3f69f198a42e
font_03_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16148 bytes
SHA-256: ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0

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