Malicious PDF — malware analysis report

Static analysis result for SHA-256 511e81fba7146f27…

MALICIOUS

PDF

77.1 KB Created: 2021-02-15 07:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41c98ae738d92154e15fee9cd86d621e SHA-1: 21f879a300e3b9b1d2aa07d97b74ed99ff93e8f4 SHA-256: 511e81fba7146f27bf32a43c88d141f6cadf877e71c5b44b204c21ffcff0711e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, https://jottigo.ru/aws?utm_term=manual+usuario+bmw+s1000rr+2015, suggests a lure related to a BMW motorcycle manual. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/aws?utm_term=manual+usuario+bmw+s1000rr+2015 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366035/normal_6006655e21835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_600f76839e14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_600aba6b04c7d.pdfIn PDF document text
    • https://muwevowaxa.weebly.com/uploads/1/3/5/9/135992822/sofurof-rudikamatik.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/LDjhKjd/50130247120.pdfIn PDF document text
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/rixitogidaf-rozojufotumaj-gigaxekit-vopaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_6004d902436ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_600d31184d4a8.pdfIn PDF document text
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/893133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383302/normal_5fddb0b2b6f64.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/4255644.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/xemudazixakoj.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/5377157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5ffaa23904191.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/84579339f7e39.pdfIn PDF document text
    • https://cdn.sqhk.co/momogajopi/ngMgchd/vufuwopazukunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_601d95db575be.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 5204 bytes
SHA-256: b5296c27b11b74eb0c50ec4f824c09a32301aba1f65cd1f0e92e45c0f62768a6
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 9960 bytes
SHA-256: a549a3ca631fa22d0a08dd4189dcbea9c13084af1431eac05f0b595da98a3108
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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