Malicious PDF — malware analysis report

Static analysis result for SHA-256 4228bf489d58787c…

MALICIOUS

PDF

86.2 KB Created: 2020-11-26 15:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 245eb3d149698de816469fff58a15d36 SHA-1: 16ea37651fa9e9ca83ab8797bc172c0d59520c8d SHA-256: 4228bf489d58787c7eca90a1263dcb8119f4b9b6c3373716d80661110020ca59
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm suggests a coordinated effort to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=t%25E1%25BB%25AD+vi+2020+canh+t%25C3%25BD In PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_5fae982da3ba6.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/fa680660c61c18.pdfIn PDF document text
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/5284171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5f9534691911a.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/ccb1bcec832e5b7.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/28cb0132d92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/79614848215.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/personalized_hogwarts_acceptance_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/walkthrough_digimon_world_3_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/62265469246.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/50110165893.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/antidiabetic_medication_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/harlequin_presents_free_downloads.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/64594640936.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/traduire_document_anglais_francais_gratuit.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5180 bytes
SHA-256: 61ce75e3dcea909265272813c0fa957741ca6a5f711a87357aa108075170bf29
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 22752 bytes
SHA-256: 36cfe4cf0d7f823245142d2aebe46938568db7b72b44a8558a40c67ceb6de24c
font_03_sfnt_off00013390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13390 16336 bytes
SHA-256: 57ae0e7b3346bad959bc9d80f10d17079bd20155f8754edf47d9cbce785fb001

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