Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db66528addbd9a6…

MALICIOUS

PDF

80.9 KB Created: 2021-01-06 03:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 58789f18a8a550f0b74892a7bf15a10a SHA-1: 4301fdff6e5dccde2b0b433292a00511d1b83376 SHA-256: 5db66528addbd9a6a16db164f6ad58d35de276ee9ec14de4ddc48aa5ade25f1f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, with the primary observed URL being 'https://traffset.ru/aws?utm_term=analog+film+filter'. This suggests the document's purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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
  • 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://traffset.ru/aws?utm_term=analog+film+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5fb5cd01a61f7.pdfIn PDF document text
    • https://wenutezow.weebly.com/uploads/1/3/5/4/135400756/furuxovazekateja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fb27a749bea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f9200f7d4478.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/jgchewD/nails_designs_for_fall.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/baziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd30168ddaf7.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/4XhjEjf/xixiresewixononov.pdfIn PDF document text
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/3360233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f9b77634459c.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/forupokisip/unblocked_games_77_bloons_tower_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/miwosixodefupowag.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/miracles_cs_lewis.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/masters_business_information_systems_monash.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_off0000db76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 4900 bytes
SHA-256: fe29da76b0f7c10d77eea693a7cdfe0213866e0cf63638d06ae8c9532d44e4d5
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 2044 bytes
SHA-256: 7819ef1de3348ad227e302ba7a5900f372fd4440a21f482bbf68fb1bc67eb97d
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 13096 bytes
SHA-256: 1fde00b1c4b1a628f1504b4dd45f27f4453008e51f8bd6c711a8f22130470f00
font_03_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16704 bytes
SHA-256: ae697ce1ee48bbcda4c609f41c5b5bfcaabc45de3a82cdd26bdc2d6d4f8f4944

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