Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da233aa9ce01e38…

MALICIOUS

PDF

99.0 KB Created: 2021-01-25 04:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e86c733ff787392a466c1189d596ec0 SHA-1: 846d69a3438f34e8a336682c0f59573ee6b5fb2c SHA-256: 2da233aa9ce01e381f1acc7ed4e3d85103a05e95e54965b2a7f55b905d0a2587
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to a large number of external PDFs, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/123?utm_term=capas+de+la+tierra+externas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_600b8c479569e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_6008f846ecd1c.pdfIn PDF document text
    • https://sesadawaroni.weebly.com/uploads/1/3/5/2/135295108/xilelavu-zezugajutujebu.pdfIn PDF document text
    • http://zazonowipudu.66ghz.com/gepokanobipedogoxidinil.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/zulezov/60545510052.pdfIn PDF document text
    • http://redotikami.rf.gd/jutasugafewewipuzaliko.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/14583988043.pdfIn PDF document text
    • http://bewululito.rf.gd/adjacency_pairs_in_conversation_analysis.pdfIn PDF document text
    • http://sogisujomixugo.epizy.com/chow_mein_image.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/stem_cell_therapy_for_heart_disease.pdfIn PDF document text
    • http://newurefaz.epizy.com/11512856899.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/65469751312.pdfIn PDF document text
    • http://gevewodex.epizy.com/40673155624.pdfIn PDF document text
    • http://bunokupisosep.epizy.com/gomimosum.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_off000142ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CA 4928 bytes
SHA-256: 5cbc17037096585b7cae792ab50b1271d1e2ba1006a93b6f318ac36cf4da9d2e
font_01_sfnt_off00015396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15396 13140 bytes
SHA-256: 30b8ac87af1ee776c2bcf62ec01785b009e17e6bfe30530e02e4d9d00b8f8b81

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