Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acb5d6fec7c10a3…

MALICIOUS

PDF

79.2 KB Created: 2021-02-22 12:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a16d36b6fc9015e3c4f57afdaa62c1ab SHA-1: 4b586e00a21f93490892fa72adc02a162d46278e SHA-256: 1acb5d6fec7c10a39c8cda34cc1abf57bd674d4487365804d9c9accc1eff7ef1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=how+to+control+thermal+comfort+in+building PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478438/normal_602ae4f48f917.pdfIn PDF document text
    • http://neuroncraft.online/apendice_de_frenillojrbeq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_6008000be9754.pdfIn PDF document text
    • http://true-board1.club/pagegoje1yvfw.pdfIn PDF document text
    • http://sellforce.ru/68865053590yiskh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_5fd85c61d59cf.pdfIn PDF document text
    • http://muvibigi.22web.org/wholesale_catalog_template_indesign.pdfIn PDF document text
    • http://pek-24.cc/tasadl44nz.pdfIn PDF document text
    • http://sq11mini.com/mitosis_vs_meiosis_chart_worksheetjjqu1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367312/normal_6007eb1abfcc9.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/vjjjjvF/lebalevipoviko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopuxoke.epizy.com/free_access_2010_software.pdfIn PDF document text
    • http://xosekipile.rf.gd/blood_test_report_for_dengue.pdfIn PDF document text
    • http://gikisomu.epizy.com/dematexegotalupun.pdfIn PDF document text
    • http://jijazofar.rf.gd/gadup.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5448 bytes
SHA-256: 55893cd5c7a08c6fde6e4482bdacb8f3351b066fd345a4bd5c70c8de4202a240
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10996 bytes
SHA-256: 6f3e59eaf95a21c4a3a03255796aa4b2579e26ba8c73ab8f6485a0146e2fb951

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